The perfect travel companion for storing and transporting your files, the 'LaCie Mobile Disk' delivers generous portable storage capacity (320GB) at an affordable price. Safely and easily carry your data anywhere thanks to its small size, and since it's USB bus-powered, plug & play, and driver-free; it couldn't be easier to use. Instantly increase storage capacity, perform regular backups, or transfer and exchange office data. The 'LaCie Mobile Disk' comes with 'LaCie Backup Assistant Software' for PC and Mac users. Comes in sturdy metal casing with a thin, lightweight design.