Form Factor: Rackmount HDD Interface: 4 x SATA Features: Reliable - Comprehensive data backup features - X-Change module for instant replacement of system module including motherboard, cooling fans and power supply - Business class system design with 3-year warranty Affordable - Low dollar per gigabyte storage with 75MBps class-leading performance - Ideal for disk based backup replacing tape - Simplified management eliminating management cost - Support business features what usually only available from big IT vendors Simple - Easy-of-use management GUI - X-RAIDS simplify RAID management - ReadyNAS Remote makes remote access easy and secure - ReadyNAS Replicate allows multi-site data replication with a single online management interface For the Hard drives compatibility, please go to http://www.readynas.com/?page_id=82 ...