HP USB 3.0 1TB Personal Media External Drive Back up fast with the high-speed USB 3.0 transfer rate and integrated software Keep tabs on storage with the power and drive activity LED indicators Secure with a lock (sold separately) through the slot on the back panel Compatibility: any USB-enabled PC; backward-compatible with PCs that have USB 2.0 operating on Windows XP 32, Windows Vista 32, Windows 7 32/64 bit Compact (8 x 4.6 x 1.5") and portable external drive. Ext. power supply needed to power the drive(included)