Western Digital WD blue SA510 250GB 500GB 1TB 2TB SSD 2.5 "SATA III internal steady state drive up to 560 MB/s for laptop / desktop / computer. 550MB/s 525MB/s（250GB）. Style :SSD. Type : Internal. About Speed: different test softwares will get different speed, speed will be affected by many different factors, our datas only as reference.