The 4 TB Western Digital My Book Live Duo Wireless External Network Hard Drive gives you doubly-safe data storage which you can access & enjoy anywhere. Personal cloud drive Now you can enjoy dual-drive shared storage on your home network, to access wirelessly from other computers, tablets, smartphones & connected devices. Create your own personal cloud without the hassle of monthly fees or undefined data location. Store media & files for secure internet access, or access them on your smartphone & tablet using WDs mobile apps. Youre effectively giving your mobile device another 4 TB of extra storage. It also offers uncompromised speed with its built-in, high-powered 800 MHz CPU, suited to the most demanding applications & best-in-class read speeds. Faster than conventional USB (Universal Serial Bus) 2.0 drives, the My Book Live Duo streams media & transfers files without missing a beat. Home wireless sharing with auto-backup The 4 TB Western Digital My Book Live Duo Network Hard Drive is the ideal dual-drive solution for consolidating & sharing data on your wired or wireless home network. Connect it to your wireless router to access & share files with any PC or Mac computer on your network. Youll benefit from automatic, wireless backup for all your computers WD Smart Ware lets you wirelessly back up all your computers to one dependable location, protecting those precious memories. So whenever you save something, its backed up right away. If you use a Mac, you can utilize all the features of Apple Time Machine backup software to protect your data. Extra-safe network storage Compatible with Windows & Mac devices, the WD My Book Live Duo means that you can stream media to your entertainment centre & access files remotely via apps for mobile devices. A secure connection is ensured by RAID 1 technology, giving you double-safe backup for your data. When the drive is set to data protection mode (mirrored mode or RAID 1), its capacity is divided in half. One side is used to store your data & the other is used for duplicate copies, so in the unlikely situation of a drive failure, your data is protected by its duplicate on the other drive. Youll be granted maximum storage capacity as this two-drive system combines both drives in one large volume out of the box. Best hard drive for entertainment The 4 TB Western Digital My Book Live Duo Wireless Hard Drive is DLNA 1.5 & UPn P -certified to facilitate streaming to your HDTV. Watch home movies or photo slideshows, or stream music, photos & videos via the built-in media server to any DLNA-certified device such as a WD TV Live network media player, Blu-ray Disc player, Xbox 360, Play Station 3 & connected TV. With i Tunes server support, the drive also lets you centralise your music & video collection to stream to any PC or Mac with i Tunes. Straightforward expandable hard drive The 4 TB WD My Book Live Duo External Network Hard Drive is a snap to set up & locate on your network. It will be found automatically in seconds on your Mac, Windows 8, Windows 7 or Windows Vista computer. Windows XP teams with WDs simple discovery software for easier drive setup. If you want to upgrade the drive, just open the case & replace the existing drive you wont even need a screwdriver. Automatically make a second copy of the hard drive on another My Book Live Duo or NAS drive on your home network for extra safe protection & ultimate peace of mind. The USB (Universal Serial Bus) expansion port means that you can turn any USB (Universal Serial Bus) 2.0 drive into an instant network drive for enhanced capacity on your WD My Book Live Duo. Simply connect the drive to the USB (Universal Serial Bus) port to automatically share it on your network. Combining storage space, security, entertainment & convenience, the 4 TB Western Digital My Book Live Duo Wireless External Network Hard Drive is a truly comprehensive home data solution.____________________________________________ Please note: Upgraded drives must be equal in size to utilize the full capacity (e.g., Two 2 TB drives or two 3 TB drives).