Samsung Electronics 840 EVO-Series 120GB 2.5-Inch SATA III Single Unit Version Internal Solid State Drive MZ-7TE120BW Worry-free data security with AES 256-bit full-disk encryption No moving parts means no hard drive spin ups, no noise and superior data protection An innovative lightweight design that allows you to work smarter and play longer. Sequential Read Speed 540 MB / Sequential Write Speed 410 MB / Random Read Speed 94K / Random Write Speed 35K Samsung's TurboWrite technology, 840 EVO can deliver much faster sequential write speeds compared to the previous 840 model, tripling the speed from 130 to 410MB/s in 120GB drives, and doubling it from 250 to 520MB/s in 250GB drives