SpecificationsMfr Part Number: ST3U56S13(SZ)Features:Affordable, high performance USB 3.0 driveUSB powered - no external power is requiredFully compatible with USB 3.0 and USB 2.0 (with some of the fastest USB 2.0 scores)Capacity: 256 GBInterface: USB 3.0Performance:Sequential Read Rate: 90 MB/sSequential Write Rate: 16 MB/sOperating Shock: 1500GOperating Vibration: 16GOperating Temperature: 0oC to 70oCError Correction: Built in ECC and bad block managementOS Support: Windows 7/ Vista/ XP, Mac OSXDimensions: 19.0 x 61.0 x 11.6 mm