HD Tach is a low level hardware benchmark for random access read/write storage devices such as hard drives, removable drives (ZIP/JAZZ), flash devices, and RAID arrays. HD Tach uses custom device drivers and other low level Windows interfaces to bypass as many layers of software as possible and get as close to the physical performance of the device possible.
The burst speeds recorded from HD tach are extremely impressive with a final figure of 415.6 mb/s, averaging at around 300mb/s. In single drive mode, the V series drive manages a burst of just under 240mb/s with an average around 180 mb/s, still very impressive.