WDs My Book Studio Edition II dual-drive, quad-interface external storage system for Mac offersoptimum performance for creative professionals. Lightning-fast FireWire 800 or eSATA interfaces combinedwith RAID 0 (striping) yields the speed you need for fast, smooth video and audio editing, renderingcomplex 3D objects or special effects, and saving huge blocks of data in record time. Set the system toRAID 1 (mirroring) for the peace of mind in knowing that if one drive in this two-drive system ever fails, thesystem continues to run and your data is safe. Includes automatic data backup software, user-serviceability,a 5-year limited warranty, and works with Apples Time Machine.