Use the My Book external hard drive by WD to transfer, back up and save your photos, videos, music and documents and free up space on your computer without losing anything. With multiple backup options, super-fast transfer speeds, password protection and more, My Book is an ideal storage solution which offers a high capacity and high security. Password protection 256-bit AES hardware encryption, the most secure date encryption available, will keep your media safe, and password protection gives you another way to keep your files safe from unauthorised access. System requirements: Windows® 10, Windows 8, Windows 7, Mac OS X El Capitan, Yosemite or Mavericks. May require reformatting for other operating systems. Also compatible with Apple Time Machine. What's included in box My Book External Hard Drive USB 3.0 cable AC adapter WD Backup™, WD Security™ and WD Drive Utilities™ software Quick install guide