Western Digital 1TB Portable External Hard Drive USB 3.0 will take care of all your storage needs; it has a pocket size design that makes it easy for you to move around. This hard drive will allow you have enough space on your laptop or desktop computer. It gives you the opportunity to always have all your files, pictures, songs, video files and documents with you at all times. This sleek and handy external hard drive is very safe for all your files and documents; you can retrieve them anytime you want. The hard disk is formatted NFTS for Windows XP, Vista, Windows 7, or Windows 8 operating systems. If you have a computer system that run on Mac OS X, it will require reformatting.