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Auto backup with included WD Backup software and Time Machine compatibility
With built-in 256-bit AES Hardware Encryption with WD Security software, just set your own personalized password to help keep your content private and safe.Password protection with hardware encryption
Reimagined design.Trusted drive built with WD reliability
Operating System: Windows 10, Windows 8, Windows 7, Mac OS X El Capitan, Yosemite or Mavericks. May require reformatting for other operating systems.
USB 3.0 port; USB 2.0 compatible
WD 4TB My Book Desktop External Hard Drive - USB 3.0 - WDBBGB0040HBK-NESN
WD 4TB My Book Desktop External Hard Drive - USB 3.0 - WDBBGB0040HBK-NESN - B01LQQHL4E