CrystalDiskMark is a disk benchmark software that analyses different types of hard drive. Giving sequential benchmark write and read statistics in MB/s. A simple program that is very useful.
CrystalDiskMark's sequential read/write test provides generally good best case results for various storage media. The data is compressible, which is why Sandforce-based drives tend to perform well in this benchmark over suites with incompressible data; comparing these results with those for AS SSD should allow the assessment of whether drive write operations are benefiting from undocumented write compression.