The Western Digital 3TB My Passport Hard Drive, serves as a useful accessory to back up your stored data. You can use the hard drive with both Windows and Mac OS systems where the prior one doesn't need any reformatting. This external hard drive has a USB 3.0 interface that can also work with USB 2.0 devices. Your data remains safe from unauthorized access thanks to the built-in 256-bit AES hardware encryption with the WD Security software. It allows you to set a personalized password for the stored data. The drive automatically takes backup at specified intervals with the WD Backup software. As the hard drive is USB-bus powered, it doesn't require an extra power cord.