Jazz Disk Bench is an application for accurately measuring performance of the storage. Both sequential and random read write is supported. It uses same method on all platforms so the result is comparable. BenchMark Description: 1.Sequential Test. Reading or writing 16MB data sequentially. Reflect the speed when copy large files. 2.Random Test. Reading or writing 4 KB blocks in a random location. Random IO play an important role in performance of your device. The slower random performance, the more possibility of lag.