The Western Digital 4TB My Passport Ultra is an external hard drive that not only makes you backup your data but also keeps it safe from unauthorized access. This external hard drive comes preformatted for Windows systems to ensure a plug-and-play operation. It needs to be reformatted to use with Mac OS systems. The external hard drive comes with various user-friendly software such as the WD Discovery, which lets you import your photos, videos, and documents from social media sites to the My Passport Ultra drive. The 256-bit AES hardware encryption with WD Security software protects your stored data from unauthorized access. With the WD Backup software, your valuable data gets automatically backed-up in the drive at specified intervals. The bus-powered operation eliminates the need for an external power cord.