| 摘要 |
A cartridge for a disk drive has a rigid shell with two keying grooves (23, 24) along the top (19) and bottom edges of one side of the cartridge. These mate with projections on the cartridge receiving slot in the drive. One of the grooves (24) extends deeper into one planar surface of the cartridge than the other groove (23). This prevents insertion of the cartridge with any orientation of the cartridge other than the correct orientation.
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