The Exabyte 221L Plus is a scalable LTO Tape Library and is the most cost-effective LTO automated tape library in its class. Accomodating up to two LTO Ultrium tape drives and 21 data cartridges, the 221L Plus provides 2.1 TB of native storage capacity (4.2 TB compressed) and a native data transfer rate of 108 GB/hour (216 GB/hour compressed). The 221L Plus ships as an external unit, black in color, and can easily be rackmounted in a standard 19" rack with Exabyte's optional rackmount kit. The unit is extremely compact, occupying just five units of rack height.The 221L Plus is an ideal economical storage solution for medium-to-large client-server networks, departmental application servers and distributed network environments. Supported applications: unattended network backup/restore, remote storage, automated archiving, imaging and hierarchial storage management.* Differences between 221L Plus (Exabyte p/c 270020-1416) and 221L (Exabyte p/c 270020-1418) are that the 221L Plus includes an ethernet connection, library monitor software and a barcode scanner.