Magnetic tape library device including cartridge exchange number restriction mechanism

Abstract

To provide a magnetic tape library device capable of easily exchanging a specific cartridge required to be exchanged under the mailslot function and shortening the time for inventory with a simple structure even with the magazine where a plurality of stages of cells for housing the magnetic tape cartridges inside thereof are loaded. The magnetic tape library device includes: a magazine which houses cartridges via a plurality of stacked cells; a device main body which houses the magazine to be freely movable; an accessor which transports the magnetic tape cartridge extracted from the magazine towards a magnetic tape drive; and a cartridge exchange number restricting mechanism which restricts the magnetic tape cartridges from being ejected out from remaining cells except for the cell where at least a specific magnetic tape cartridge is housed out of the plurality of cells on the very front row of the drawn out magazine.