KingSpec 2.5 inch SATAIII 6GB/s 240GB 256GB MLC Internal Solid State Hard Drive NAND Flash memory: NEW 3D NAND Supported systems: Windows XP,Windows 7,Windows 8.1,Windows 2003,Windows 2008, DOS, Linux, Unix, etc. Warranty & services: Three years free exchange and fast response after sales service. High-performance, safe and reliable Max. Sequential Read speed: 520MB/s Max. Sequential Write speed: 420MB/s .