MyDigitalSSD BP4 mSATA SSD Review (240GB) – Best Value Available For an SSD To Date


ATTO Disk Benchmark is perhaps one of the oldest benchmarks going and is definitely the main staple for manufacturer performance specifications. ATTO uses RAW or compressible data and, for our benchmarks, we use a set length of 256mb and test both the read and write performance of various transfer sizes ranging from 0.5 to 8192kb. Manufacturers prefer this method of testing as it deals with raw (compressible) data rather than random (includes incompressible data) which, although more realistic, results in lower performance results.


The MyDigitalSSD BP4 mSATA SSD hit ATTO highs of 558MB/s read and 463MB/s write, write speeds being considerably lower than listed specifications although decent for an mSATA SSD.


Crystal Disk Benchmark is used to measure read and write performance through sampling of highly compressible data (oFill/1Fill), or random data which is, for the most part, incompressible. In the BP4, we have provided the result with random data samples as both results were extremely similar.

BP4 CDMark

Although the sequential read transfer speed of 520MB/s is one of the highest we have seen in Crystal DiskMark yet, the high sequential write performance of 216MB/s left us wanting higher performance but is typical of what is normally seen when implementing new NAND flash memory.  Looking back at the BP3 we reviewed previously, we can see that the overall performance of the BP4 is much better, however, the high sequential write performance of the BP3 was 314MB/s with the Toshiba 24nm Toggle Mode memory.  Conversely, the BP4 displays much better low 4k random write performance at 74MB/s.


Up until recently, AS SSD was the only benchmark created specifically for SSD testing and it uses incompressible data.  AS SSD, for the most part, gives us the worst case scenario in SSD transfer speeds because of its use of incompressible data and many enthusiasts like to AS SSD for their needs. Transfer speeds are displayed on the left with IOPS results on the right.

BP4 AS SSD BenchBP4 AS SSD IOPSAS-SSD is probably the best indicator yet of the Phison S8 being a mid-level controller and support for this is evident in the drives Total Score as well as the relatively low IOPS result seen on the right.


  1. The 60GB model sounds very nice as an Intel SRT drive on my Gigabyte GA-Z77-DS3H.

  2. How come your CrystalDiskMark 3.0 results vary so much from what is advertised on MyDigitalSSD for the 240GB BP4, in particular your 4K write of 74.55 is only 54.36 on MyDigitalSSD?

  3. It still looks like Crucial CT256M4SSD3 256GB m4 makes better choice though. At leaset with amazon UK prices – I see it is more expensive in US, lol.

  4. is the 120gb much slower? what would be an estimate % of performance loss? thanks

  5. Typo. . .”MyDigitalSSD sold there version at a better price than ADATA did the SX300.”

    “sold their” ??

    Any chance you recorded the bytes per sector? if we’re coming from a 512 and this is a 4k, we can’t clone. 🙁

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