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 benchmark highs of 549MB/s read and 519MB/s write are almost dead on with leasted specifications.
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. We have provided the results of testing in highly compressible data on the left and that of highly incompressible data on the right.
Low 4k random writes above 90MB/s are excellent. We also get a good look at that in which we detailed earlier with the lower write performance when testing in highly incompressible data. This is typical of all LSI SandForce SSDs and can be considered a definite identifying feature .
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.
AS SSD results are strong and we get a first peek at IOPS performance, this a bit lower than specifications state. This should come up somewhat in Anvil testing we think. Taking a look at the AS SSD Copy Benchmark, we can see that the OCZ Vertex 3.20 SSD is a very strong SSD, resulting in some of the fastest file transfer speeds we have seen to date.