Imation Defender H100 500GB USB 2.0 Portable External Hard Drive:Capacity: 500GBUSB 2.0FIPS 140-2, level 3 validationAES 256-bit encryption implemented in CBC modeOne-factor authentication includes administrative controls to manage up to 10 users and robust support for complex and custom password policiesSystem compatibility: Windows XP/Vista/7 and Mac OS 10.