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.
Listed specifications for the RC8 are 270MB/s read and 240MB/s write and we attained highs of 272MB/s read and 266MB/s write which is just about the top of the SATA 2 spectrum. Also very positive was just how quickly higher performance was reached in lower transfer sizes.
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 Express RC8, we have displayed testing using highly compressible data on the left, compared to that of incompressible on the right.
Typically, even testing in highly compressible data, we see lower results in Crystal DiskMark when comparing to that of ATTO, however, the result on the left seems to have held its ground in this case. It is also good to see fairly decent low 4K random write performance here, and in fact, this is about the best you can get in a flash drive.
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.