The LaCie d2 Quadra (301110U) 500 GB FireWire 400 (1394a) Hard Drive is fully compatible with PC, Mac systems.The Hard Drive connect by: FireWire 400 (1394a), USB 2.0, FireWire 800 (1394b), eSATA for External utilization. Spinning up to 7200 RPM and offering capacity as large as 500 GB