64GB version announced real 58.6 GB What we are concerned with these high capacity USB drives, this is usually the large file transfer speed :) So test for a 4GB file, see photo (run from an SSD). W7 64bit on my PC, transfer 2 .mkv file 4GB took less than 2 minutes, or an average of 70 MB / s (USB 3.0 ports on the front of the case) The key is enough class anyway!