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 benchmarks returned results slightly lower than advertised specifications which were 224MB/s read and 211MB/s write transfer speeds. This is a bit unusual as, in typical consumer SSD testing at least, ATTO had always provided the highest overall performance simply because of its use of highly compressible data.
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. Many new SandForce Driven SSD owners who cant wait to test the performance of their SSD often grab this program and run a quick test, not realizing that they are testing with incompressible data rather than compressible data used in testing by manufacturers. We have provided incompressible (random data) results:
Up until recently, AS SSD was the only benchmark created specifically for SSD testing and it tests in the worst case scenario for the most part with incompressible data.
AS SSD is the toughest test around for transfer speed performance and, to once again see those high sequential scores, is a huge plus for the Samsung SM825; this rarely being seen in any consumer SSD.