Western Digital 160 GB External USB 2.0 Hard Drive with Dual Option Backup Dual-option Backup &#8211; choose how and when to back up your data, automatically or on-the-spot USB 2.0 interface &#8211; high-speed connection for maximum throughput ??Front-mounted power button &#8211; equipped with WD's exclusive Safe Shutdown&#8482; feature that ensures all data has been safely transferred before shutting down the drive ??7200 RPM rotational speed Preformatted*; simply plug it in and go