The new generation storage technology The external SSD VX500 Verbatim uses a high -speed flash memory and a second generation USB 3.1 controller, optimized to provide unparalleled performance. Reading speed: Up to 500 MB/SEC Speed in Scripture: up to 290 MB/sec*GB = 1 billion byte. The ability available for storage will be lower; The device uses up to 10 % of the formatting memory and other functions. See http://www.verbatim.com/flashcapacity.