The Clickfree HD327 320GB Portable Automatic Backup Hard Drive in blue is a convenient external drive that is compatible with both PC and Mac operating systems. With a storage capacity of 320GB, this HDD-only drive allows for seamless backup of your important files. Its portable design and automatic backup feature make it a hassle-free solution for ensuring the safety of your data. The USB interface and compact size make it easy to use on the go, while the Clickfree brand ensures quality and reliability.