Want the speed of an internal Hard drive in a pocket portable size? The VisionTek USB Pocket SSD (120GB) might be what you?re looking for. Rated at speeds up to 455MB/s Read and 440MB/s write the VisionTek USB pocket SSD should not only meet your speed needs but also your size requirements. Sporting a generous 120GB usable space the drive is actually 256GB but uses 16GB for true SSD features like Trim.