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The IBM 3584 TS4500 Tape Library Model L55 is a base frame designed for IBM TS1060 LTO Ultrium Fibre Channel, IBM TS1050 LTO Ultrium Fibre Channel Tape Drives, and LTO data cartridges. The Model L55 base frame has up to 882 cartridge slots (up to 730 in frame 1) and support for up to 16 tape drives (up to 12 in frame 1). Up to 16 logical libraries (one per tape drive) can be configured for each frame.
Each Model L55 library has two standard 18-slot cartridge I/O stations for importing or exporting LTO tape cartridges from the library without requiring a re-inventory. For bulk loading of tape cartridges, the library door can be opened. Each time the library door is closed, a bar code reader mounted on the autochanger is designed to scan the cartridge labels enabling a re-inventory of the cartridges in the library frame in as little as 60 seconds. A door lock is included to restrict physical access to cartridges in the library.