The Zebra Snap-in Mobile Rack, the Snap-In Mobile Rack installed inside the Zebra eSATA or eSATA/USB drive enclosure, is a convenient external removable hard drive system. When attached to system via USB 2.0 or a hot swappable eSATA port, hard drive of any capacity can be conveniently added or remove from the system, similar to a tape cassette. With eSATA connection, the hard drive in the Zebra Snap-in Mobile Rack can also be used as the main drive to boot your system and for running all your applications.