The Hewlett Packard SureStore TapeRack holds up to four HP DLT 70r, DLT 40r, and HP DAT24r SureStore drives and is designed to fit into Compaq, Dell, and IBM 19-inch server racks. These three removable tape drives are especially designed for the TapeRack. They are hot-swappable, enabling you to exchange drives in a matter of seconds without having to shut down and restart your server. These drives, combined with TapeRack's dual hot-swap power supplies, provides you with a non-stop backup capability you can rely on, day in and day out