Western Digital has created the sleek and stylish My Book External Hard drive that allows you to store or back up your files with an ultra-fast transfer rate. The included Acronis True Image WD Edition software suite can back up your entire disk drive or just selected partitions. In addition you can securely delete confidential data you no longer need with the software. With the use of Dropbox you can even back up your files to the cloud. Have the peace of mind knowing that WD security's password and hardware encryption is protecting your data from unauthorized access. Storage Drive Features Ultra-fast transfer rates with USB 3.0 or 2.0 2 TB of secure storage Works with Windows XP, Vista, 7 and newer, and Mac OS X 10.6.5 or later(requires reformatting) Automatic file backup for your computer Password protection with hardware encryption Dimensions (LxWxH): 139.3mm x 49mm x 170.6mm Trust Western Digital to protect your valuable data with their demanding requirements for durability, shock tolerance and long-term reliability. The Source has all of the storage solutions and streaming devices you need to make your home Network the envy of all your friends.