| 摘要 |
Disclosed herein is a magnetic tape cartridge including a cartridge case in which a single reel with magnetic tape wound on an outer periphery of a reel drum is rotatably housed. The magnetic tape cartridge further includes a locking member, provided within the reel drum so that it is movable between a locking position and an unlocking position in the axial direction of the reel. The locking member is used for locking the reel to restrain rotation of the reel during periods of non-use. In the magnetic tape cartridge, a first radial clearance between the locking member and the reel drum is set smaller than a second radial clearance between the reel and the cartridge case so that when the magnetic tape cartridge is vertically loaded into a cartridge drive unit, chucking failure is prevented.
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