Verbatim Store 'n' Go USB 2.0 Portable Hard Drive Comes with Green Button energy saving software (suspends the hard drive from spinning while not in use increasing efficiency and saving energy) Nero BackItUp and Burn Essentials software provides 3 applications in 1; back up all your files folders and drives whenever you want or schedule the auto back up to a set time for added security; Nero Express gives you the option to burn your files to CD or DVD and with Nero RescueAgent you have an option to recover files should they become damaged New unique and stylish design Powered by USB Formatted in FAT32 for use on Windows OS and Mac OS systems Compatible with Windows® 2000/XP/Vista™ Firewire works with Mac OS 9x and Mac OSx10.1 or higher Capacity: 320GB Dimensions (WxDxH): 117mm x 81mm x 16mm Weight: 135g Manufacturer's 2 Year Limited Warranty