disk benchmark utility
CrystalDiskMark is a disk benchmark utility that measures performance for sequential and random reads/writes of various sizes for any storage device. It is useful for comparing the speed of both portable and local storage devices. CrystalDiskMark requires admin rights to operate.
CrystalDiskMark Portable works best with the PortableApps.com Platform
CrystalDiskMark can measure sequential reads/writes speed, measure random 512KB, 4KB, 4KB (Queue Depth=32) reads/writes speed, has support for different types of test data (Random, 0Fill, 1Fill), includes basic theme support and has multilingual support (though it will not yet remember your language selection between runs).