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Overview SATA SSD Plextor M8V: the original recipe

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After the second half of last year all the major manufacturers of flash memory has started to produce multilayer chips with 64 layers, we began to actively look at a variety of SSD, using exactly the same semiconductor base. As you know, Samsung uses in its own storage 3D NAND chips in different levels of integration for a long time, and based on them products cause only positive emotions. But other manufacturers of flash memory, particularly Toshiba, Intel, Toshiba and Sandisk, until recently lagged considerably behind South Korean firms to improve their own versions of the three-dimensional flash memory. To catch up with the leader they did it only when moving to 64-layer design 3D NAND that Samsung competitors received a dramatic improvement compared to previous versions. So today we can say that the key benefits of the products on the basis of the three-dimensional memory manifest itself in any solid-state drive based on the 64 layer 3D NAND, regardless of the memory of some of the manufacturers used in each case. In other words, focusing on products, built on a 64-layer 3D NAND, you are likely to get productive and very reliable drive with a fairly attractive price.

The only problem is that until a new generation of three-dimensional memory is not widespread. Apparently, manufacturers there are some production difficulties that do not allow 64-layer memory to begin expansion on a broad front. And at the moment drives based on this memory, I suggest either only by manufacturers of NAND chips, or their very close associates. For example, if we talk about SATA SSD, the stores are only a few built on a 64-layer 3D NAND mass models: 860 Samsung EVO, Crucial MX500, 545s Intel SSD, Kingston UV500, SanDisk Ultra 3D, R Puls, Western Digital Blue 3D NAND and Toshiba TR200. And half the models on this list available is very limited.

In these circumstances the appearance on the market some new models, built on current versions of the three-dimensional memory, can only be welcomed. Fortunately, the number of suppliers of the SSD gradually join the producers of the second echelon. One of the first to work with the 64-layer memory purchased from Toshiba, Plextor. Being a subsidiary of a major OEM manufacturer Lite-On, Plextor has a strong engineering capabilities, and its SSD each time represent a very original and very interesting on the characteristics of the products. It happened at this time. The first SSD based 64-layer TLC 3D NAND Toshiba (BiCS3), Plextor released, became NVMe drive Plextor M9Pe, which was quite good for an inexpensive solution with PCIe 3.0 x4. But today we will talk about the second brainchild of the engineers of Plextor, which followed M9Pe designed a more public model M8V SATA.

Immediately is to say that from a technological point of view, Plextor M8V – a very interesting and unique solution. The fact that it BiCS3 Toshiba memory operates under control of controller Silicon Motion, which is usually only used memory Intel or Micron. But the developers of Plextor managed to combine the components before us to be seen together never had. That is why Plextor M8V and caught our attention. SATA drives based on BiSC3 memory, tested in the laboratory 3DNews before, used the Marvell or Phison controllers and showed relatively good performance. However, Silicon Motion recent progress in the development of their controllers stronger competitors, so we do not exclude that Plextor M8V will be the best demonstration of the advantages BiCS3 NAND. It only remains to verify in practice.


The basis Plextor M8V elected controller Silicon Motion SM2258. It is not the latest SATA controller the developer, but the most common. The first time we ran into him at the beginning of 2016, and now it is widely used in SSDS with 32-layer 3D NAND flash from Intel or Micron. In addition, it is possible to find promising innovations, for example, Crucial MX500 drive of the latest generation, built on a 64-layer 3D NAND Micron authorship. The popularity of chip SM2258 is due to the best combination of performance and price. This controller relates to a number of relatively low-cost solutions: it is based on a single-core 32-bit RISC processor for interaction with an array of flash memory offers only four channels. However, the finished product usually obtained is quite good from the point of view of performance: this software helps in optimization with a focus on minimal latency when processing mixed operations and technology dynamic SLC caching.

At the same time, together with Toshiba BiCS3 memory one can use the controller SM2258 never tried, and Plextor in this regard – a pioneer. In theory no problems with it should not be. On the one hand, in the controller there is support for technology NANDXtend, within which strong algorithms of error correction based on LDPC codes, which should be a guarantee of the reliability of the platform. On the other – is itself BiSC3-memory is a kind of 64-layer TLC 3D NAND, provides a good level of performance, especially when compared with planar flash memory. In this we see when testing, for example, drive R Puls. Most importantly, unlike the Samsung, Toshiba proposes to install in SATA SSD crystals NAND capacity of 256 GB, which allows to obtain arrays of flash memory with a high degree of parallelism.

The result M8V Plextor boasts of the following set specification:

Manufacturer Plextor
Series M8V
Model number PX-128M8VC PX-256M8VC PX-512M8VC
Form factor 2.5 inch
Interface SATA 6 GB/s
Capacity, GB 128 256 512
Flash memory: type, process technology, manufacturer Toshiba 64-layer 256-GB BiCS3 3D TLC NAND
Controller Silicon Motion SM2258
Buffer: type, volume DDR3L-1600,
256 MB
512 MB
1024 MB
Max. sustained sequential read, MB/s 560 560 560
Max. sustained sequential write speed, MB/s 400 510 520
Max. speed of random read (blocks 4 KB) IOPS 60000 81000 82000
Max. speed random write (blocks 4 KB) IOPS 70000 80000 81000
Physical characteristics
Power consumption: inaction/read-write, W N/a
MTBF (mean time between failures), million h 1,5
Resource record, TB 70 140 280
Dimensions: D × H × d, mm 100 × 69.85 mm × 6,8
Weight, g 60,0
Warranty period, years 3

To be honest, the Datasheet doesn’t look too promising. Plextor has included in the lineup M8V only version of the small volumes (less than half a terabyte), and this clearly indicates that the company believes the new entry-level product that should find its place in a relatively cheap builds. Does not emit much optimism and announced the terms of the warranty. Three years is a typical value for a storage low level, though allowed amounts of rewriting is relatively good. The hypothetical user is allowed to overwrite the half of the SSD capacity daily.

It turns out that the position of the SATA Plextor flagship M8V attack and does not intend, and this is reflected including in the announced performance. If you believe these numbers, then at the moment M8V Plextor is one of the weakest SATA SSD, built on a 64-layer TLC 3D NAND. Even budget drive Toshiba TR200, in which the array BiCS3 devices is controlled by dual-channel UN-buffered controller Phison S11, the list of passport characteristics promises higher performance.

However, declared by the manufacturers characteristics of the performance not always depict a picture adequately, because they did not report the implementation of the technology rapid entry has become an integral attribute of a modern SSD. To get clarity on this question, we conduct a special test, in which check the performance of continuous serial write on a clean drive. In the case M8V Plextor 512GB dependence is the following.

And here it turns out two important circumstances.

First, the engineers of Plextor hacked at the root one of the important advantages of the controller SM2258 – dynamic SLC caching. In M8V instead implemented quite ordinary static SLC cache, which is not available in the user region of the array of flash memory. And this cache has a relatively small size. The storage capacity of 512 GB with only 4 GB. So, in versions M8V a capacity of 256 and 128 GB SLC cache has a capacity of 2 and 1 GB respectively.

Second, the array of flash memory-based devices BiCS3 works under control of the controller SM2258 clearly not the best way. So, M8V Plextor 512 GB speed direct linear memory writes is about 330 MB/s. But at the same time similar in composition and organization of the array of flash memory for use with the Phison S10 controller produces 450 MB/s (for example, Smartbuy Puls), and the array of the 64-layer devices Toshiba 3D NAND TLC when working with the controller SM2258 able to receive data at a speed of 420 MB/s (e.g., Crucial MX500). It turns out that by combining the Silicon Motion controller with a three-dimensional memory Toshiba, the developers of Plextor’s absolutely nothing won, but rather lost, at least from the point of view of the performance of the linear record.

However, to classify the Plextor M8V among the outsiders also should not be. Write speeds of 330 MB/s is not so little. For example, the new Samsung EVO 860 in polterabayta the volume is even slower array of the flash memory. Besides, Plextor did not skimp on the DRAM buffer, and even more, did it twice more capacious compared to the typical size. This means that M8V can be a good solution for arbitrary melkoplodnyj loads, for which the controller is actively used memory.

#Appearance and internal structure

Discuss in this review the drive exists in two versions: in the traditional 2.5-inch form factor (M8VC) and M. 2 2280 module with SATA interface (M8VG). Both of these modifications are functionally identical. Therefore, getting acquainted with the 2.5-inch model, we automatically generalize all findings to all family M8V.

For the tests we were given the option of drive capacity of 512 GB is the eldest and the most productive model in the family. This SSD 2.5-inch version was not surprised by its appearance: it Plextor have not changed for the last few years. The casing is made of unpainted aluminium, with traces of processing. On the front side of the paint manufacturer’s logo, the back has a sticker with technical information.


Note that Plextor does not hide the label nor a release date drive or uploaded at the factory firmware version.

The housing mounted circuit Board, occupying slightly less than half of the internal space. Full Board in modern drives are no longer used: manufacturers of flash memory have learned to do such chips NAND, which can accommodate up to 1 TB of memory a few crystals of NAND, so to squander the PCB makes no sense. Capacious SSD can be done using two or four chip flash memory.

This is the case and Plextor M8V volume of 512 GB. Despite the fact that it is the older version in the lineup, an array of NAND in it, typed four TSOP-chips Toshiba TH58TFT0T23TA2H. Each chip is Packed in four 256-Gigabit semiconductor crystal 64-layer BiCS3-a three-bit memory cells. This means that the four channel array of the flash memory in M8V 512GB uses a fourfold alternating devices in the channels.


Manages the array controller SMI SM2258. The design M8V uses exactly the same version controller as in Crucial MX500. That is, no modifications to implement support BiCS3 in a base chip to do not have: compatibility achieved software-only effort. Note that Plextor M8V controller without any pads. However, this is not a problem: SSD temperature during operation remains very low.

In addition to the NAND chips and controller on the motherboard M8V placed and released by Samsung chip DDR3L-1600 SDRAM used as a buffer when melkoplodnyj operations and to store a copy of the table of address translation. 512-Gigabyte drive this chip has a capacity of 1 GB. Plextor often uses in his drives, DRAM buffer is increased in size, and M8V exception to this rule is not.

Interesting also worth noting is the presence of on-Board storage marking CV8-CE512. It is a reference to the name of identical models produced under the brand name Lite-On. That is, M8V, like many other products of Plextor, has a twin brother in the lineup of the parent company.

It is worth noting that the declared capacity of the representatives of the lineup of Plextor M8V multiples of 128 GB. This means that the manufacturer gives a 93 percent capacity of the array of flash memory, and operating system 512 GB SSD will offer 477 GB free space. The remaining one-third of the volume of activated SLC cache, and two-thirds are involved in the technology of garbage collection and wear-leveling, and is also used as a replacement Fund.


Before the Plextor was paid to software support for their products very much attention. For storage, the company has developed an extensive set of programs, including “conventional” service tool, and additional tools for caching, compression, and data encryption. However, in early 2017 further development of these software tools was abandoned, but at the moment the old version is quite cope with the tasks assigned to them and even remain compatible with new products, in particular with Plextor M8V.

The main utility for SATA SSDS production Plextor is called PlexTool. By today’s standards, it is not rich in functionality and looks too pretentious, but the basic questions about the drive it reply. Using PlexTool can learn General information about SSD, read the contents of SMART, and get control over the flow of the TRIM command.


In addition, the utility can upgrade the firmware of the SSD is estimated to test the performance and serve to drive Secure Erase command.

Another utility, PlexTurbo, you can provide an additional level of caching disk operations using the computer’s memory. This gives you the opportunity to increase the speed of operations is often sagastume files and reduce the load on the drive. However, such software solutions are fraught with potential danger: in the event of unplanned outages or failures of computer data that failed to be written from the RAM cache on the SSD, of course, will be lost.

In addition, storage series M8V PlexTurbo utility functions in abbreviated form: the maximum amount of the generated in-memory cache is limited by the size of 1 Gbytes.

Another program from a set of Plextor – PlexCompressor. This utility is an add-on file system which performs automatic compression of unused files, freeing up extra disk space. Moreover, this compression works very selectively. In order not to create excessive load on the CPU, it affects only those files that are not used by the user at least during the last 30 days. In the same case, when this compressed file will be hit, it will be returned to its original state.

The last utility, which you must tell is PlexVault. It proposes to realize the drive’s data encryption. However, you need to understand that we are not talking about hardware-based encryption, which M8V not implemented, and pure software algorithms, which, when their work load on the CPU.

PlexVault can create one or more encrypted containers, and in normal conditions they are visible only in the program authorized users who know the “secret” key combination and password. However, to use such a tool in serious applications, we still wouldn’t advise — at least because the Plextor not share any information about the used encryption algorithms and does not conduct independent audits of its cryptographic solutions.


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Review of an external SSD drive, Samsung Portable SSD T5: pocket 850 EVO

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Range of products of Samsung, is based on the flash memory is not limited to the internal SSD. Yes, SATA and NVMe SSD is one of the most popular and popular products for Samsung users of computer technology, but its proprietary 3D V-NAND memory, the South Korean manufacturer applies for the production of and other categories products: memory cards and external portable SSD. And these products is not related suggestions made on the principle of “to be”, and it is high quality and interesting characteristics of the products in their respective categories to fight for the leadership.

The right to say so came out of nowhere. Recently we tested the microSD card and came to the conclusion that Samsung EVO Plus is one of the best media for photo/video equipment and mobile devices. Today we talk about the Samsung Portable SSD T5 – external portable data carrier, which according to formal characteristics, also seems to be the leader among all similar solutions. At least if we talk about those drives which have a USB interface.

Besides, T5 is not a pen test, and the result of the evolutionary development of the respective hardware platform. South Korean developers involved in the design and construction of portable SSD since the beginning of 2015, when the world saw the first Samsung external drive – T1. T5, in turn, is already the third edition of the Samsung pocket drive with USB interface. It appeared about a year ago, but to this day remains a very relevant proposal. Looming just on the horizon new external SSD called the Samsung X5 is not a mass and does not replace the T5 product for the reason that it relies on rare Thunderbolt interface. Samsung T5, unlike the X5, you can use everywhere – not just any computers, but even with tablets and smartphones based on Android operating system.


In General, the SSD – not too popular decisions. As the proliferation of various cloud services, the need for such devices declined markedly. However, high-speed Internet at your fingertips is not always the case, and in this case Samsung T5 able to help. The basic idea, which is embedded in the hardware design of this drive is quite simple: the external SSD have to offer about the same features that ensure the internal SSD. T5 was created with an eye to users when communicating with them had about the same experience as working with a normal SATA SSD.

This is achieved in a fairly simple way: the Samsung Portable SSD T5 is a variation popular in the last internal drive 850 EVO, adapted to work via the USB interface. It is therefore not surprising that the hardware of the external model consists of a 64-layer flash memory 3D TLC V-NAND the fourth generation (this memory was used in 850 EVO is the third version and is used in 860 Samsung EVO) which is controlled by a standard controller Samsung MGX. However, as external link Samsung T5 is not used SATA, and USB 3.1 Gen 2 with theoretical bandwidth up to 10 Gbps, which allows the T5 to offer roughly the same performance characteristics as the 850/860 EVO.

Samsung Portable SSD T5
Capacity 250 GB, 500 GB, 1 TB, 2 TB
Interface USB 3.1 Gen 2 (10 Gbps) backwards compatible
Data transfer rate Up to 540 MB/s
Size 74 × 57,3 × 10.5 mm
Weight 51 g
Mode UASP (USB Attached SCSI Protocol) Supported
Encryption Hardware AES-c 256-bit key
Guarantee Three years
Price (official) 250 GB — 7 490 rubles.
500 GB — 9 990 RUB.
1 TB — 19 990 rubles.
2 TB — 39 990 rubles.

Lineup Samsung T5 includes four SSDS with capacities from 250 GB to 2 TB and overall characteristics of the corresponding models coincide with those specifications that were declared for the Samsung 850 EVO: in particular, the maximum speed of sequential access is limited to the value of 540 MB/s. Yes, it is not up to the bandwidth of USB 3.1 Gen 2, but T5 will still obviously more productive than those outside the SSD, which are based on the last version of USB 3.1 Gen 1 – there is a maximum data transfer rate is limited by the value of 450 MB/s.

Based on the bandwidth of USB 3.1 Gen 2, Samsung T5 could be faster, but the problem is that it is based on MGX controller, originally designed to work with SATA. T5 is implemented is not the most elegant solution to sum up this drive, with USB 3.1 Gen 2, it added the additional host bridge SATA-USB. This approach increases delay and does not fully use the entire bandwidth of the latest version of the USB interface, but it allows Samsung to unify the SATA and USB drives and reduce the cost of T5.

In addition to the use of additional front-end of the bridge, the Samsung Portable SSD T5 is different from internal drives and another fundamental point – the type of the default file system. Initially, the external drive is formatted with exFAT and not under the usual for Windows users NTFS. This is done with a specific intent: NTFS is a closed file system that does not have full support in operating systems Linux (e.g. in MacOS or Android), so to extend the T5 compatibility with different devices, developers have relied on a more common alternative. The result is your Samsung external drive without any problems can be used not only with computers but also with mobile devices, game consoles, media centers, smart TVs and so on. However, nothing prevents the user in case of need to reformat to NTFS and T5.

The rest of Samsung T5 quite predictable. What we saw in the Samsung 850 EVO, one way or another is available in the drive. For example, in the T5 uses a standard SSD technology is Samsung SLC TurboWrite cache as well as SATA SSD to visually see her work only in version external SSD with a capacity of 250 GB. More capacious versions of the T5 have a sufficient degree of parallelism of the array of flash memory that allows you to demonstrate writing speed 500 MB/sec for the entire capacity of the SSD.

Unlike many other external drives, Samsung T5 under the Protocol UASP (USB attached SCSI) supports the TRIM command, which allows him to demonstrate consistently high recording speed, is not subject to any degradation as you use.

However, it requires support from the operating system. For example, if we talk about Windows, the flow TRIM it to exFAT file system is not possible. So if you are going to use the T5 primarily with Windows computers, reformat it to the NTFS file system is not devoid of meaning.

However, even in the case of a standard T5 for exFAT file system, typical for external drives linear operations performance degradation due to the exhaustion of the pool of free pages on flash memory is not observed. The firmware this drive has been optimised to maintain the constancy of the speed of sequential writes, and she is very good at it. No drops write performance on Samsung T5 large files is not observed, at least if we are talking about storage capacity of 500 GB and above, where the array of flash memory has a sufficient degree of parallelism.

Like their desktop counterparts, Samsung T5 supports encryption with AES-256. To activate a hardware cryptographic engine to the program (in versions for Windows, Mac OS and Android), which is encrypted SSD hidden in a special read-only partition of the drive capacity of 81 MB.

Encryption uses the hardware features of the controller Samsung MGX, and its inclusion does not lead to any performance degradation.

Have with Samsung T5 and quite detailed S. M. A. R. T. diagnostics, which has a complete set of characteristic drives the South Korean manufacturer settings. In particular, available data about the development of the resource and the condition of the cells of the flash memory. However, keep in mind that compatibility with T5 have not all the programs for monitoring the disk subsystem, but only those who understand the Protocol UASP.

#Appearance and internal structure

Design the Samsung Portable SSD T5 corresponds to its purpose. The drive has a fairly small size (slightly more than half of the usual 2.5-inch SATA SSD – 74 × 57,3 × 10.5 mm) and light weight (about 50 grams). Made of the considered SSD in a flat metal case with rounded edges, allowing you to carry it in your pocket and not damage clothes. In addition, the body made of metal, makes the T5 solution is very reliable in mechanical terms is to break it during transport or use almost impossible. And the ability of the drive to endure the fall with two-meter height made in the specification. However, moisture not declared.

To connect the drive on one of its ends is located the slot of the USB Type-C. the Necessary connecting cables are included in the package. Samsung has not stinted on two USB cable: cable with two plugs Type-C on both ends and the cable, one end of which ends with plug Type A. this means that the T5 comes with everything needed for its interface as with desktop computers, and mobile devices. However, it should be noted that the wiring length is only 45 cm.

Next to the USB connector on the end of the drive is disguised as a blue led, illustrating the performance and activity of the gadget.

Case T5 has two color variations depending on the volume SSD. Blue colors are provided for versions with a capacity of 250 and 500 GB, black same color is used for the terabyte and dvuhterabaytny model.

For detailed acquaintance with the device Samsung T5 us was dismantled modification capacity of 500 GB. And no wonder – the inside of this external SSD proved to be very interesting. The fact that he was assembled from two separate parts: the adapter from the USB 3.1 Gen 2 mSATA and a full drive in the mSATA version.

The adapter is made on the basis of single-chip bridge ASMedia ASM235CM: on the one hand it carries USB 3.1 Gen 2 Type-C, and on the other is equipped with a mSATA slot that you are installing to a SATA drive a corresponding form factor. An important feature of this adapter – redundant power scheme in which there are three capacitor of 100 microfarads, is needed to prevent data loss when sudden power outages T5 from a computer or external device.

As for the set in the adapter mSATA drive, that’s a regular Samsung 850 EVO third version in the mSATA version. In this case, the drive capacity is 500 GB, it really is based on a 64-layer TLC 3D V-NAND recruited two chips K9OMGY8H5A equipped with Samsung MGX controller and LPDDR3 memory-buffer in size of 512 MB.

Special about this Samsung 850 EVO just firmware. She has an obvious optimization for the sequential operations and adapted to the exFAT file system.

It is worth noting that e-filling Samsung T5 does not use aluminum casing for its cooling: no termoenergetyczny pads, allowing the heat away from the chip controller and flash memory in the design is not provided. And it is in vain: when recording on an external SSD large amounts of data it can overheat. Upon reaching the temperature of the drive 65-degree mark turns on the throttle, resulting in a temporary drop in performance of the drive by about half.


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Overview NVMe drives Toshiba: XG5-P, XG5 and BG3

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Speaking of storage, the Toshiba company can be safely attributed to the number of leading players at least because it has not only a flash memory but with the development Department engaged in the creation of controllers and original designs SSD. Such vertical integration to date, has mastered only a few. But in addition, Toshiba was able to win a significant enough market share, which in the last quarter unexpectedly exceeded 10 percent and that Toshiba came in third place for the supply of the SSD after Samsung and Western Digital. I must say that for the layman such statistics sounds surprising, since the Toshiba drives come in-assembled computers very rarely, and just not common in retail. However, the fact remains: the power Tohisba is the ability to work with OEM manufacturers, and ready-made computers and laptops from manufacturers such as, for example, Dell or MSI solid state drives this company really are very frequent.

However, from time to time Toshiba has attempted to expand its presence in the retail market. So, with this purpose, it in 2013 was bought by American brand OCZ, under which the company began to sell their featured products. In parallel but separate model drives Toshiba is trying to promote under its own brand, and, interestingly, a one-to-one correspondence between sentences of OCZ and Toshiba is not. Moreover, with the popularity of the NVMe interface as a means of connecting SSD drives, Toshiba began to use their traditional Japanese brand. As a result, the current lineup NVMe drives Toshiba really deserves a detailed acquaintance: on the one hand, it includes interesting consumer characteristics of the products, on the other, albeit limited, but its representatives still meet on the shelves of local stores.

Today we will get acquainted with up to three NVMe SSD Toshiba: XG5-P, XG5 and BG3. All of them have in common is that they are based on a proprietary 64-layer TLC 3D NAND, which the company produces under the marketing name BiCS3 (Bit Cost Scalable). We have already met several times with drives from other vendors, built on the basis of a memory, and experience suggests that three-dimensional memory Toshiba has everything you need to be a good Foundation for a SSD with a good combination of performance and price. Particularly revealing example in this regard recently tested in our laboratory WD Black NVMe. This drive showed that BiCS3 memory at least is not inferior in performance to the 64-layer flash memory competitors, and with the right approach and optimization algorithms it can be an excellent basis for high-performance solutions.

However, confuses one “but”. We all remember that of all the options the 64-layer TLC 3D NAND memory Toshiba is demonstrating in tests not too optimistic endurance. However, private drives, the Japanese manufacturer is and may well not deal with: there is a high likelihood that products sold under its own name, chooses the best Toshiba semiconductor crystals, selling at way less good silicon.

As a result, today’s testing can be a source of new revelation: we will look at actual fast NVMe drives Toshiba, which claim to compete with the recognized leaders. At least, this is evidenced by their price: are SSD, Toshiba’s expensive and how it is justified, we will see below.

#Toshiba XG5

XG5 at the moment is the base NVMe-range Toshiba. Now the company has a more advanced model XG6, which uses freshly-96-layer memory BiCS4, but until the supply of these novelties are only a trial, since the production of three-dimensional memory of the fourth generation are running the Toshiba only in pilot mode.

As for Toshiba XG5 is fully debugged and streamlined design, which uses components produced commercially and in large quantities. The display is its own controller Toshiba TC58NCP090GSD developed by the engineers of the Japanese company. Little is known about him, but, judging from the markings, it can be assumed that this controller is a further development of the chip TC58NCP070GSB used in the OCZ RD400. This may mean that some support for the development of a new platform was provided by company Marvell, but no official confirmation of this.

An array of flash memory in Toshiba XG5 assembled at the eight-channel scheme, it is made up of the TLC 3D NAND devices of the third generation ( Toshiba BiCS3). Architecture BiCS3 defines two sizes of crystals – 256 and 512 GB, and both variations of this are used to XG5. Memory with less cores is placed in version storage volume of 256 and 512 GB, and memory cores a capacity of 512 GB gets into the terabyte modifications. Therefore, Toshiba is working to increase the level of parallelism of the array of flash memory, and even the younger version XG5 can offer quite high performance.

Toshiba XG5 specification is as follows:

Manufacturer Toshiba
Series XG5
Model number KXG5AZNV256G KXG5AZNV512G KXG5AZNV1T02
Form factor M. 2 2280
Interface PCI Express 3.0 x4 NVMe 1.2
Capacity, GB 256 512 1024
Memory chips: type, interface, process technology, manufacturer Toshiba 64-layer 256-Gbit 3D-NAND TLC (BiCS3) Toshiba 64-layer 512 GB TLC 3D NAND (BiCS3)
Controller Toshiba TC58NCP090GSD
Buffer: type, volume DDR3L-1866, 256 MB DDR3L-1866, 256 MB DDR3L-1866, 512 MB
Max. sustained sequential read, MB/s 2700 3000 3000
Max. sustained sequential write speed, MB/s 1050 1050 2100
Max. speed of random read (blocks 4 KB) IOPS N/a N/a N/a
Max. speed random write (blocks 4 KB) IOPS N/a N/a N/a
Physical characteristics
Power consumption: inaction/read-write, W 0,003/4,5
MTBF (mean time between failures), million h 1,5
Resource record, TB N/a N/a N/a
Dimensions: Ghvhg, mm 80 x 22 x 2,23
Weight, g 7,3
Warranty period, years N/a

Curiously, Toshiba has decided not to specify for XG5 indicators performance melloblocco load. Usually this comes for UN-buffered SSD designs to ahead of time not to shock the potential buyers, but XG5 tactic of “partial silence” is rather linked to something else. DRAM buffer in the drive is provided, however, it has several lower-than-usual volume, and per Gigabyte of storage capacity has 512 KB of RAM.

Another interesting detail of the specifications of the duality of performance: in addition to the base level Toshiba leads the other slightly lower. The fact that XG5 is available with two versions of the firmware and the manufacturers of laptops, for which it is important an operating time from batteries, can request for a slower version with reduced energy appetites.

As in any other consumer drive on the basis of a three-bit memory cells, high speed when you record data provided by the SLC algorithms-caching. The XG5 cache implemented on a static scheme, and its size is very small. For example, in version SSD 1 TB cache size was about 3 GB. And this means that when writing significant amounts of data, the SSD will have to face a drop in performance. This is clearly seen on the graph showing the speed of continuous linear recording XG5 capacity of 1 terabyte large file.

The memory array assembled from 16 devices BiCS3 (as in the XG5 512GB or 1TB), can provide pretty good speed and in live recordings in TLC mode – about 900 MB/s. But it is below the speed of direct memory writes from the best models of competing NVMe SSD, such as NVMe WD Black or the Samsung 970 EVO.

Externally, the Toshiba drive XG5 looks quite unassuming. No heat sinks, and heat-dissipating labels in standard not provided. Moreover, it shows that it is an OEM product: on the label on the drive, given only the article, and nowhere marketing the product name.

Special mention deserves the fact that all the chips on the XG5 is located on one side of the M. 2 card form factor 2280. This design is useful for use in thin laptops, where the often used “low” slots. To achieve the same compactness engineers Toshiba have due to the placement of all the semiconductor crystals BiCS3 that make up the array of flash memory, only two chips. For example, in tested in our laboratory version of the SSD capacity of 1 terabyte each chip flash memory contained inside 8 crystals.


According to the requirements of corporate customers, XG5 and supports encryption. The label is the PSID is the key. But implemented in the firmware of the cryptographic engine is responsible only to the TCG OPAL standard, that is, work with Windows BitLocker is not supported.

#Toshiba XG5-P

XG5-P is the advanced version of the previous drive, which Toshiba introduced a little later, the original version. At the announcement of this model was said about improved speeds melkoplodnyj operations and the expansion of the model range upwards to limits. So, with the release XG5-P was the available storage capacity of 2 TB, though in this case the updated a series not included the Junior version.

In the end, the specifications XG5-P got the following.

Manufacturer Toshiba
Series XG5-P
Model number KXG5APNV1T02 KXG5APNV2T04
Form factor M. 2 2280
Interface PCI Express 3.0 x4 NVMe 1.2
Capacity, GB 1024 2048
Memory chips: type, interface, process technology, manufacturer Toshiba 64-layer 256-Gbit 3D-NAND TLC (BiCS3) Toshiba 64-layer 512 GB TLC 3D NAND (BiCS3)
Controller Toshiba TC58NCP090GSD
Buffer: type, volume LPDDR3-1866, 1 GB LPDDR3-1866, 2GB
Max. sustained sequential read, MB/s 3000 3000
Max. sustained sequential write speed, MB/s 2100 2200
Max. speed of random read (blocks 4 KB) IOPS N/a 320 000
Max. speed random write (blocks 4 KB) IOPS N/a 265 000
Physical characteristics
Power consumption: inaction/read-write, W 0,003/4,9
MTBF (mean time between failures), million h 1,5
Resource record, TB N/a N/a
Dimensions: Ghvhg, mm 80 x 22 x 2,23
Weight, g 7,3
Warranty period, years N/a

Here are Toshiba already did not hesitate to report the performance for random reads and writes, but the high will not name them: they are about one and a half times less than promises 970 Samsung EVO WD Black or NVMe. As for the speed of linear operations, compared to XG5 they have not changed.

Improved performance in XG5-P passed with relatively little rework on the hardware level. It does not change either the base controller or PCB design. The growth performance is due to three fairly simple steps. First, the introduction of microprogram optimization. Secondly, increasing the degree of parallelism of the array of flash memory. And third, by increasing the capacity of DRAM buffer.

If older versions XG5 in the chip was Packed in 8 units BiCS3, XG5-P they are already 16. Due to this the drive controller got the opportunity to use more effective fourfold alternating devices in their channels. In addition, the DRAM buffer is increased in volume by half and purchased a standard size calculated according to the formula “1 MB to 1 GB”.

In this case the engineers decided not to touch the algorithms SLC-caching, which in the previous version caused some criticism due to the small amount of cache. But even on a 2-terabyte version XG5-P high speed can be recorded just the same 3 GB of data. Here’s how it looks on the chart performance of linear continuous recording:

Speed direct sequential write to the flash memory XG5-P increased compared to XG5 about 10 percent, but this can hardly be considered a major achievement.

Externally, XG5-P is almost indistinguishable from the XG5. Gives a new modification only using DDR3 chips made by Samsung, and not the Nanya. But this is a minor change.

Most importantly, even 2-terabyte version XG5-P has retained one-sided design. So, releasing a SSD drive, Toshiba met the inquiries of the manufacturers of slim laptops who want to install in your system SSD the high capacity. Moreover, according to the specifications, XG5-P was neither more greedy nor more than hot.


#Toshiba BG3

BG3 is a very special and unique in many ways NVMe-product of Toshiba. Initially it is a single chip drive BGA (Ball Grid Array), focused on the OEM market. The idea behind SSD is that the controller and the crystals NAND placed in a single BGA package size of 16×20 mm can be mounted directly on the printed circuit Board in miniature devices is usually applied in such cases eMMC devices. However, in addition to the BGA-version, Toshiba has decided to offer a “custom” option BG3, is made in the standard M. 2 module, but with very small sizes to suit the form factor 2230 (22×30 mm).

Generally speaking, form factor M. 2 2230 is supported in hardware are rare. Therefore, Toshiba BG3 is a specific product. Have BG3 is more convenient to use in mass systems version with size 2242, it is sold under the name Toshiba RC100. However, for this review we received from the manufacturer is BG3, and therefore see firsthand: drives M. 2 2230 support not every motherboard.

Toshiba develops range of drives in the BGA-version with 2015. BG3 is the most relevant SSD of this kind, which, as described above and XG5 XG5-P uses in its design, the flash memory Toshiba BiCS3 – TLC 3D NAND the third generation with 64 vertically spaced layers. For such drives the developers of Toshiba use some special controllers, about the device which do not have any details. However, apparently it is quite intelligent in its solution properties.

Although a single chip design and SSDS seem to be quite an interesting discovery, you need to understand that such miniaturization is not cost free. Such drives have limited capacity, and in addition, they can use a wide front end tires. So, Toshiba BG3 is connected to the system with only two lines PCI Express 3.0. The maximum volume of such a device is 512 GB. Another limitation is the lack of the design of the drive DRAM buffer. So BG3 is a compromise between size and performance. But a clear advantage is achieved in heat dissipation and power consumption. The same BG3 somewhere in half to two times more economical than any other NVMe SSD.

We should not think that the Toshiba BG3 is very bad for performance the drive. Its specifications given below, and it is clear that it will quickly some full-fledged desktop solutions, for example, the same Kingston A1000.

Manufacturer Toshiba
Series BG3
Model number KBG3AZMS128G KBG3AZMS256G KBG3AZMS512G
Form factor M. 2 2280
Interface PCI Express 3.0 x2 – NVMe 1.2
Capacity, GB 128 256 512
Memory chips: type, interface, process technology, manufacturer Toshiba 64-layer 512 GB TLC 3D NAND (BiCS3)
Controller Toshiba
Buffer: type, volume No
Max. sustained sequential read, MB/s 1300 1400 1500
Max. sustained sequential write speed, MB/s 600 800 1000
Max. speed of random read (blocks 4 KB) IOPS N/a N/a N/a
Max. speed random write (blocks 4 KB) IOPS N/a N/a N/a
Physical characteristics
Power consumption: inaction/read-write, W 0,005/3.3 V
MTBF (mean time between failures), million h 1,5
Resource record, TB N/a N/a N/a
Dimensions: Ghvhg, mm 30 x 22 x 2,38
Weight, g 2,6
Warranty period, years N/a

The secret ingredient unbuffered Toshiba BG3 lies in support for NVMe Host Memory Buffer (HMB), which is discussed in detail in the review of the Transcend SSD 110S. The bottom line is that in the compatible operating systems (for example, in current builds of Windows 10) BG3 can use for their needs the main memory when it is accessed directly via the PCI Express bus in the DMA mode. This allows the drive does not lose performance when melkoplodnyj operations, as occurs with other SSD models dispossession of DRAM. In addition, regarding the consumption of main system memory, do not worry: the drive is reserved for their needs just about 10 MB.

Helps to raise productivity and technology SLC-cache. In BG3, as in other Toshiba drives, it is implemented in a static scheme, but the amount of cache is increased: record in accelerated mode possible for very large amounts of information. So, when sequentially writing data to a free BG3 with a capacity of 512 GB, you can observe the following picture of performance.

The entry in SLC-mode is performed at a speed of around 900 Mbps and on a clean drive at a pace you can record approximately 16 GB of information. In TLC mode the speed of the linear record falls to more typical SATA SSD 400 MB/s, but in fairness it should be noted that normal users hardly face.

It turns out that although on-chip performance, BG3 is a normal budget NVMe drive using to connect the bus PCI Express 3.0 x2. Its main feature – not an unusual performance, and appearance. And look at it definitely is: the much smaller size of the SSD in our lab has not happened.


Do: on a printed circuit Board mounted just one chip that fit all. In addition to the controller chip shown in the photos of the drive capacity of 512 GB is eight crystals BiCS3 memory with capacity of 512 GB. However, in fairness it should be noted that it BG3 is still present some additional electronic components that implement the power plan. But still, the size of the drive is comparable with the size of the SD card, and it’s impressive. Such a tiny SSD is certainly suitable not only for compact mobile computers, but also, for example, for IoT devices.


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Composite testing of microSD memory cards with capacity of 64 GB

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If you want to choose the best memory card for camera or smartphone, but you are not sure, then you have come to the right place. In this article, we talk about differ from one another in-market memory card, and give practical response to the question, what specific memory card may be better in certain scenarios.

In 2018 the memory card is ubiquitous. They are used in many types of consumer electronics ranging from phones and cameras to laptops, drones, and video recorders. Quality work all these gadgets directly depends on how relevant to them is a hand-picked card. And it’s not just in capacity: capacity of memory cards, as their price can vary significantly, and different gadgets impose completely different requirements to the speed of the used media. If the memory card is selected incorrectly, it may directly affect the operation of the gadget — to the point that he even refuses to perform its functions. Therefore, the study of the practical characteristics of memory cards under load of different types is a very important study, which allows you to find the most suitable for each variant, while not overpaying for useless features.

#Is a little about the history and standardization of the SD card

Standard memory cards Secure Digital (SD or briefly) acquired widespread in the early 2000s, after in 1999 the three companies – SanDisk, Panasonic and Toshiba – have decided to unite and develop a unified specification compact removable media based on flash memory. Now, after almost two decades from that moment, you can already confidently say that the goal was achieved. The initiative caught on, and the SD card have actually become a unified industry standard, despite the fact that produce these memory cards dozens of companies. An excellent illustration of the success of standard SD cards may be the fact that now in the development and implementation of this standard is somehow involved more than eight hundred different companies. This is good news.

The bad news is that, despite the existence of a single standardization body, special organization of the SD Association, without zoo of different types of memory cards the deal is still not done. On the market cards are different form factors, capacities and performance classes. Moreover, although in General the devices made in accordance with a common standard and for the most part compatible with each other, they are not interchangeable. Part of on the market cards are better suited to download apps and work in Android smartphones because they have the best performance during operations random read, others are better at sequential operations, which is critical for recording high resolution videos, photos, and more.

The SD Association has done a lot of engineering work to develop a technical standard compact media, but outreach and marketing activities of this Association raises many questions. What, for example, is the fact that each new version of the SD specification were introduced into circulation a new classification of high-speed parameters and added to the existing new variants of marking. In addition, the names of the types of memory cards were added various modifiers, and to date the situation has come to a point where numerous logos on the package flash-cards, even an expert will not be able to define what it is to be expected in practical use. But do not fear: in this article we present a simple and detailed explanation of classification cards, and in addition, we compare the actual performance of the most relevant cards microSD 64 GB.

#Form factors SD card

The simple and clear distinction between different SD cards is their physical size. Despite the fact that at a logical level, no differences between the different form factors, there is three different size memory cards: standard, mini and micro.

It is obvious that the cards of different size are used in different types of devices, and more compact cards are usually used in a more portable gadgets. In this case, since SD, MiniSD and MicroSD are made in accordance with a common standard, they can be interchanged using simple adapters. Thus, the most compact MicroSD cards often come with the adapter that allows their use in full size SD slots, and backward compatibility is not affected. The use of adapter has no effect neither on speed, nor on anything else. So microSD cards are the most versatile option and can be installed in devices with a microSD slot and a normal SD slot.

Card microSD with adapter for standard slots

As for form factor MiniSD, he in modern devices it is almost never used. Moreover, it is not exaggeration to say that today he is dead.

#Capacity and types standard

The capacity of the memory card is, perhaps, another obvious feature. Although SD cards may have a size from 1 MB to 2 TB (and in the future – and even more) confused here is extremely difficult, especially as on any memory card, its capacity in gigabytes is specified in such a large font that not find or correctly read this value impossible.

However, the SD Association has worked hard to ensure that ordinary people got some headache even here. The fact is that depending on the capacity of the SD card refers to the different types are: SDSC, SDHC, and SDXC. This classification is due to the use of different file systems, and as a result each type has its own frame capacity devices.

A standard SD card SDSC (Standard Capacity), first appeared on the market, could have a maximum size of 2 GB, but they understandably outdated and have virtually not found. Larger cards with a capacity from 2 to 32 GB are of type SDHC (High Capacity), and the most capacious today a card type is SDXC (eXtended Capacity), and their size can reach a theoretical limit of 2 TB.

Each of these types has its own file system. Old SDSC used FAT12 or FAT16, SDHC, moved to the FAT32 file system, and in the most modern SDXC exFAT is used. Here it is worth emphasizing that the use of exFAT caused at the time a lot of disputes. The fact that it is a closed file management system that has limited support in operating systems. As a consequence, SDXC cards may not work in some free Linux distributions, and require a relatively fresh variants of Windows (at least XP SP2 or Vista SP1) and Mac OS X (10.6.5 and above). The same reformatting the SDXC card in a different exFAT file system is possible, but can lead to loss of compatibility with the target gadget, for which it was originally intended.

In 2018 to the list of types SD-card added one – SDUC (Ultra Capacity). It identifies the device with maximum capacity from 2 to 128 TB and continues to use the exFAT file system. In the sale of these cards yet, but obviously soon we will have to deal with the fourth type of SD card.

Although the capacity of SD cards and their type there exists a one-to-one correspondence, to think about the variety of purchased cards you still need. The fact that compatibility between devices and different SD-cards is only one sided. So, if the gadget is compatible with SDXC, it will not only support SDXC but SDHC card. But the device without the support of SDXC cards those cards will not work.

#Speed characteristics of the memory card

Devices of different type using a memory card with different intensity and impose different requirements on their speed characteristics. In order to let users easily choose a memory card in accordance with their needs, the SD Association has introduced additional classification of SD cards for performance levels. In theory it’s supposed to help the correct selection of cards, but with each new version of the standard introduced a new ranking scheme of class performance, and to date, determined for five different parameters that illustrate the speed capabilities of the SD card: speed class, UHS, UHS speed bus, speed class video the class performance for applications.

Manufacturers of memory cards can be used as part or all these options for marking their products, which can cause some confusion. But it’s not as difficult as it seems at first glance.

Speed class (normal). Designation normal speed class (Speed Class) in the form of a number in a circle with a gap you can find almost any memory card or on its packaging. Specification defines four different classes – C2, C4, C6 and C10. This quantitative parameter specifies the minimum guaranteed speed of linear recording in megabytes per second. For example, the class 10 speed means that the recording card will provide a performance not lower than 10 MB/s.

Although sales still continue to meet the memory card of the lower classes of speed, almost all the current offers comply with speed class C10. It is believed that such performance is sufficient for recording at least a standard video stream with a Full HD resolution with standard compression.

Because memory cards of lower speed classes C1, C4 or C6, it is clearly outdated products, the choice we suggest is to immediately dismiss such proposals. Fortunately, the market for them remains very little.

UHS speed class (Ultra High Speed). Here two SD Association defines speed class UHS Speed Class 1 and UHS Speed Class 3. They are indicated by a logo with the letter U, inside which is inscribed the number 1 or 3. UHS class 1 corresponds to the minimum speed of the linear record is 10 MB/s and UHS class 3 guarantees a write speed of 30 MB/s.

While UHS class 1 is actually equivalent to the usual tenth of the speed class, UHS class 3 is a guarantee that the card will record video in Full HD with frame rates up to 120 FPS or standard video to 4K.

Speed bus UHS. Although this speed parameter has a similar name to the previous one, actually no relation to him has. We are not talking about the possibility of the array of flash memory running inside of the card and the bus on which the memory card communicates with the device host. Current memory cards use two versions of the external bus – UHS-I or UHS-II. Version UHS-I allows you to transfer data with a maximum theoretical speed of up to 104 MB/s in one direction, and the UHS-II has a maximum throughput of 312 MB/s in one direction or 156 MB/s in full duplex mode. On memory cards and packages version of the tire is indicated by the usual Roman numeral I or II.

Most memory cards, which are presented in the stores, use the bus UHS-I. gradually, However, begin to meet-and higher-speed UHS-II device. They are easy to distinguish not only marking, but also due to the fact that these memory cards have a second row of contacts, by the use of which achieves the speed increase. However, this also means that although cards that support UHS-II and is able to work with devices with the bus UHS-I, use them in such gadgets makes no sense – the maximum speed they will not develop. However, backward compatibility standards in this case is completely smooth, so if the required speed within the bandwidth of the first version of UHS, it is allowed to install UHS-I card in devices that support UHS-II.

Left – UHS-I microSD card; right – UHS-II microSD card

Also worth mentioning that in 2017 the SD Association released the specification of the bus UHS-III, the capacity of which reaches up to 624 Mbps. At the moment of the existence in nature of memory cards or gadgets with support for UHS-III we do not know, but I’m sure with time the market will come with such solutions.

You need to understand that the bus speed UHS – parameter that has no explicit effect on the performance of the memory card. The implemented version of the tire only determines the maximum speed of the interface. Therefore, purposefully chasing UHS-II devices only makes sense in that case, if you really need a speed of about 90-100 MB/s. While providing such a performance when you record only a single SD card of the last generation, the cost of which exceeds the cost of any UHS-I memory card several times.

Speed rating for video. Another additional feature according to which the SD Association proposes to classify memory cards, a point aimed at an audience of users who shoot videos in high and ultra-high 4K and 8K. Speed class for video (Video Speed Class) is denoted by V and a following number, which is the minimum guaranteed write speed to the card. The specification introduces the following classes: V6, V10, V30, V60 and V90, and to them belong the SD card with the sequential write speed is above 6, 10, 30, 60 or 90 MB/s, respectively.

It is clear that different types of classification have intersection. So, V6 corresponds to the ordinary high-speed class 6; V10 is the same as the speed class 10 or UHS Speed Class 1 and UHS-3 speed intersects with the requirements of the V30. However, such a multiplicity of entities not confused by the SD Association, which presses on the fact that additional classes speed video to allow you to choose a memory card for movies in a more universal single rule. It is believed that while the V30 card should be enough for 4K shooting, the maps corresponding to the classes V60 and V90 should be interested in videographers working with image formats 8K at a frame rate of 60 or even 120 FPS.

If you compare all the classes that characterize the sequential write speed, we get the following table, which should be understood as a cross between speed classes, introduced different editions of the specifications for SD cards.

The minimum speed of the linear record, MB/s Speed class UHS speed class Speed class video
2 C2
4 C4
6 C6 V6
10 C10 U1 V10
30 U3 V30
60 V60
90 V90

Class performance for applications. As soon as memory cards were actively used not only in photo – and videocameras, but also in smartphones or tablets, the SD Association has to think about the necessity of classification from the point of view of their application in such devices. The fact that when using Android devices a critical feature is not only sequential write speed, but the speed of random melkoplodnogo read and write. Operations of this type occur when run from SD-card applications and the storage they work files, and this is a completely different load that has nothing to do with the usual sequential writes.

To rank the cards according to their suitability for installation, storage and running programs was introduced two additional class Application Performance Class A1 and A2. Their logos can also sometimes be detected on SD cards or their packaging.

To quantitatively describe the performance class for applications is not so simple: within these classes are set the minimum speed simultaneously under several loading scenarios.

Class performance for applications Minimum speed of random read IOPS Minimum speed of random writes IOPS The minimum speed of the linear record, MB/s
A1 1500 500 10
A2 4000 2000 10

In addition, the memory card corresponding to the class A2 should maintain a number of additional features more specific to SSD. Among them is the caching of data in the internal DRAM, the job queue of queries and a set of tools for maintenance of the array of flash memory (stand-alone garbage collection).

However, the A2 class was determined just a year ago, and the SD card are not on the market. A pity, because due to the implementation of additional functionality they have become devices to a whole new level, closer in its properties to modern high-tech solid-state media.

#Working voltage

Another characteristic on which different SD card, it is used a signal voltage. Until recently, they used a single voltage level is 3.3 V, but last year, the SD Association introduced LVS-card (Low Voltage Signaling) focused on voltage of 1.8 V and is designed for use in economical devices. Such an energy efficient card should be marked with a special logo with characters LV.

The need to transition to a lower voltage associated with the fact that the high-speed memory card that works with the most rapid options bus UHS-II and UHS-III, began to show excessively high levels of heat dissipation. While for a normal map is characterized by the dispersion of 0.5-1 W of heat at maximum load, the heat dissipation of high performance memory cards can go up to several watts, which causes problems with cooling and it is totally unacceptable for most mobile gadgets.

The standard requires that LVS-card should not become a completely separate class of carriers. Specification requires that they will work with any device that uses as low and usual level of signal voltages. Thus, the problems to the owners of LVS-card – they are suitable everywhere. However, for gadgets that require extremely economical SD cards, suited cards only LVS-varieties.

At the moment the vast majority sold in stores memory card does not support low voltage signal. But gradually they will be more widespread, and their existence must remember when choosing the right mobile carrier information.


In theory to understand what the properties of one or the other memory card, can be printed on its obverse surface of the characters. Normal at the moment, the set of markings includes the capacity and type of memory card and class speeds (normal). Often in addition to that you can find the logo version bus UHS and UHS-speed class. Speed class for videos and apps rarely indicated, but such cards also occur. The General principle is: the greater role played by the manufacturer in the SD Association, the more different logos he placed on the map. It is therefore not surprising that especially are full of different markings SanDisk memory card.

However, you need to understand that to focus on the logos – not the wisest decision. First, the conformity of the declared classes is only the opinion of the manufacturer of your product, is not confirmed by any independent tests. Second, the speed classes define mainly only one parameter – speed of the linear record, but in reality memory cards vary and other options performance. Thirdly, the ranking adopted by the SD Association classes allows you to get information about the cards is only a very rough approximation.

All understand this and the producers themselves. So some of them stand in marked or indicated in the specifications is not only classes, but also direct high-speed characteristics of its products. However, most often this is done only in the case when the manufacturer wants to boast speed and then some for additional details on speed in this way can be found only for memory cards with high cost.

#Table tested microSDXC memory card 64 GB

For the first tests (and they certainly will be continued) we have collected common in retail card microSDXC capacity 64 GB. Form factor microSD selected on the basis of the greater prevalence and universality of these cards, because in a standard SD slot they can be mounted via an adapter, which in most cases comes with the microSD card in the kit. The capacity of 64 GB – one of the most popular at the moment offers. Maps of this volume help to save approximately 2880 photo resolution 36 MP, more than two hours of 4K video with high bitrate or more than 6 hours of video with a resolution of Full HD.

Today’s test only affects cards with UHS-I interface — as the most common and most popular options. Higher-speed UHS-II cards have begun to appear on store shelves, but now their acquisition is hardly appropriate: they are expensive and the devices that actually need such high-speed characteristics, are extremely rare.

Most of the testing of the memory cards provided with “M. Video” is one of the leading retail chains selling electronics. This allows us to ensure we reviewed the major memory cards available and popular in Russia.

Before proceeding to a detailed familiarity with the tested microSD cards, it is worth noting one important point. Speed memory cards in each case is determined not only of the inherent speed characteristics, but also by how well implemented the UHS interface in the host. There are cases when the performance of SD cards is not revealed is the fault of the reading device, and to sin in this case, the memory card is clearly not worth it. Big set of examples of situations where performance is constrained by memory card that is on the host side, can be observed with an inexpensive card readers unknown origin that flooded domestic outlets and Chinese online stores.


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