The Seagate Expansion Portable hard drive offers an easy-to-use solution when you need to instantly add storage to your computer & take files on the go. Drag & drop file saving, right out of the box. USB (Universal Serial Bus) powered. Fast data transfer with USB (Universal Serial Bus) 3.0 connectivity. The Expansion Portable hard drive can be installed easily by plugging in a single USB (Universal Serial Bus) cord. You can start saving your digital files to this external hard drive within seconds of removing it from the box. Digital photos, videos & music files can tax your computers storage, causing performance to decline as its internal hard drive fills to capacity. The Expansion Portable hard drive features a range of capacities, with the 4 TB model offering enough data storage for up to 4, 000 hours of digital video, up to 1000 two-hour DVD films up to 1, 280, 000 digital photos or up to 66, 640 hours of digital music. The drive is automatically recognised by the Windows operating system ? no software to install & nothing to configure. Drag & drop to save files to the Expansion Portable drive. Built-in power management automatically ensures energy-efficient operation.