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.
Considering that posted specifications for performance are 230MB/s read and 190MB/s write, our ATTO high results of 277MB/s read and 237MB/s write are excellent for this SSD.
Crystal Disk Benchmark is used to measure read and write performance through sampling of raw (0/1 Fill/compressible) or random data which is, for the most part, incompressible. We tested in both compressible and incompressible samples and the results were virtually identical.
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.
CDM and AS SSD give us our first glimpse of the low 4k random write performance of 47MB/s which is substandard in today’s SSD arena. The disk access time shown on AS SSD is excellent and will result in quick system start up times.