Toshiba’s Portable External Hard Drives make computer backup simple. Our drives take the complexity out of backing up your computer data by providing easy-to-use backup software for both Windows and Mac users. Powered by USB 2.0, you can take your files just about anywhere. Just one click and you’re on your way to creating a digital safety net to help protect your files. With Toshiba’s Portable External Hard Drives, you’ll enjoy mobile storage space for even the largest digital libraries. Our 500GB1 Drive is capable of storing up to 142,000 digital photos, or 131,000 digital music files, or 410 downloaded digital movies. Toshiba’s Portable External Hard Drives work with both Mac and PC computers and include software that makes backing up your computer simple. Note: The part number (P/N) that appears on the packaging is used to identify all the items in the box, including the hard drive (which has its own distinct model number), color, software, cable, user guide, etc. This number is used for ordering purposes. The model number that appears on the bottom of the hard drive is used to register the device with regulatory agencies (UL, FCC, etc) and identifies a specific mechanical and electrical design.