Patent ID: 7168649

Claim:
A combination of a tape cartridge and a tape drive, the tape cartridge having a reel incorporated therein, and being insertable at the tape drive, said tape drive carrying out at least one of reading and writing of data and has a rotating member that is integrally connectable to the reel when the tape cartridge is inserted, the rotating member including a drive gear for transmitting a drive force to the reel, a central protrusion, and a positioning portion for relatively positioning the reel and extending inwardly to contact the central protrusion, said tape cartridge comprising: a reel gear, which is substantially ring-shaped and is meshable with the drive gear for transmitting the drive force; a reel reference portion, which is disposed inside the reel gear and is operative to abut against the positioning portion for the relative positioning; and a plate attached to the reel reference portion, the plate having at least one opening, wherein the reel reference portion includes at least one protrusion extending through the at least one opening, and wherein the positioning portion comprises a magnet, and the plate is attracted to the magnet.