Plextor M5 Pro SSD Review (256GB)
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.
ATTO read and write performance highs of 547MB/s and 457MB/s are almost dead on the listed specifications of 540MB/s read and 460MB/s write which is a great start.
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 M5 Pro, we have provided the result with random data samples as both results were extremely similar.
Crystal DiskMark is typical, although we would have like to see low 4k random write scores coming in a bit higher. Keeping in mind that this is not a new release, we are always hoping to see SSDs come in above the 100MB/s low 4k random write point which is still relatively uncommon.
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.
Two things are very predominent in AS SSD testing that would result in such a high Total Score, these being the incredibly fast Access Times and the 4k-64Thrd IOPS of just under 100,000 IOPS read and 80,000 IOPS write.