TRENDnet 2-Bay Diskless SATA I/II Network Attached Storage Enclosure TS-S402 (Black) Share documents, videos and more at Gigabit speeds 2 Serial ATA I/II hard drives of your choice (HD not included) Quickly expand your storage or download media with 2 external USB ports Manage your data from any Internet connection Control content and user access with the feature rich management interface Schedule data backups via FTP and HTTP servers without turning on your PC Supports your favorite USB storage devices such as external hard drives and flash drives. Ensure complete mirrored backup with RAID 1 and improve performance with RAID 0 technology Features to make two hard drives act as one Provides USB one-click backup, to copy USB contents to HD just by pressing a button