Fast, green and Mac ready, WD's My Book Studio Edition II dual-drive, quad-interface external storage system for Mac offers optimum performance with up to one-third reduction in power consumption - get the speed you need and save a tree. Lightning-fast FireWire 800 interfaces combined with RAID 0 (Striped) yields high performance for fast, smooth video and audio editing, rendering complex 3D objects or special effects, and saving huge blocks of data in record time. Includes automatic data backup software, user-serviceability, a 5-year limited warranty, and works with Apple's Time Machine. This My Book Studio Edition II external hard drive is the affordable way to save your precious memories including up to 571,000 photos, 500,000 songs or 150 hours of video. Configurable to RAID 1 (Mirrored) eSATA, FireWire 800/400 and USB 2.0 and 1.1 Interface System Requirements - Mac OS X 10.4.10+, 10.5.2+, Windows 2000/XP/Vista; Available eSATA, FireWire 800/400 or USB 2.0 port Approximate Unit Dimensions - 3.87(W) x 6.54(H) x 6.06(L) Approximate Unit Weight - 5.2 pounds