The IronKey Workspace W700 is available in three capacities, 32GB, 64GB, and 128GB and since it uses flash memory, speeds are much faster than a typical HDD. IronKey devices undergo thousands of hours of rigorous read/write tests. The W700's sequential speeds are rated for 400/316 MB/s read/write over USB 3.0, this performance is more than five times the minimum required for Windows To Go certified devices. As a result, the W700 is the fastest Windows To Go drive in the market period.