CrystalDiskMark is a small HDD benchmark utility for your hard drive that enables you to rapidly measure sequential and random read/write speeds.
WD Caviar Green 2 TB SATA Hard Drive:
WD Caviar Black 2 TB SATA Hard Drive:
Benchmark Results: CrystalDiskMark v2.2 shows some very big performance differences between the WD Caviar Green and the Caviar Black hard drives when running the 100MB file size test. With 4K file sizes the WD Caviar Black was 87% faster than the WD Caviar Green in Read tests and 30% faster in the write test!