| 摘要 |
<p>In order to ensure an accurate operation of a reel stopper means, it is provided a magnetic tape cartridge comprising a magnetic tape wound around a single reel, a cartridge casing in which the reel is housed for rotation and a reel stopper means for locking or releasing the reel, wherein the reel stopper means comprises a braking member with a braking gear, and an outer diameter of an engagement gear formed by engagement gear teeth on engagement projections on the reel is larger than an outer diameter of the braking gear.
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