Storage Library

A data storage device containing one or more drives, multiple removable storage elements (e.g., tapes or optical disks), and a mechanical device that moves the media between drives and storage locations. Storage libraries can be physical (e.g., a large-scale tape library with multiple robotic changes and tens of thousands of tapes), but also can be virtual. A virtual tape library (VTL) is an all-disk system that behaves as if it were a physical library in order to support specific software applications.