Buffalo Drivestation Duo 500 GB Desktop External Hard Drive HD-W500IU2-R1 Box Contents - One DriveStation Duo, Quick Setup Guide, Setup CD-ROM with Memeo Backup Software for PCs, USB 2.0 Cable, Firewire Cable and Power Cord Two High Speed 7200 RPM Serial ATA Hard Drives No need to Install Drivers with Auto Setup Pre-formatted Hard Drive for immediate use Supports RAID 1 and Full Capacity Spanning Modes