Buffalo  DriveStation Duo 1.0 TB (2 x 500 GB) USB 2.0 & FireWire Combo External Hard Drive HD-W1.0IU2/R1 DriveStation Duo; USB 2.0 Cable ;Setup CD Rom with Memeo Backup Software; FireWire (IEEE 1394a) Cable; AC Adapter;Warranty Statement Two SATA Drives for Maximum Flexibility, Spanning Mode or RAID 1. USB and FireWire! Auto Power Feature Turns On and Off Automatically with Your PC Auto Setup-Connect using USB 2.0 or FireWire (IEEE1394) interfaces for flexible, high speed, and plug and play connections. Windows and Mac OS 10.3+ RAID Setup Utility