Memorex Mirror for Backup 500GB USB 2.0 2.5" External Hard Drive (Black) Memorex Mirror for Backup 500 GB 2.5-inch External Hard Drive General Features: Black and silver color USB 2.0 interface 2.5-inch form factor 500 GB storage capacity Automatically backs up your documents upon connection to your computer USB Bus powered Automatic monitoring, backup and reminders 5400 RPM spindle speed 480 Mb/sec transfer rate 8 MB data buffer