Recording tape cartridge

A tape drive for carrying out at least one of reading and writing of data at a tape cartridge which is insertable at the tape drive, wherein the tape cartridge includes:

• a case;
• a single reel rotatably provided in the case, the reel including a first center of rotation thereof;
• a tape unwindably attached to the reel;
• a tape access opening provided at the case;
• and
• a covering member which is reciprocally moveable along a circular arc-form movement path between a closed position for closing the tape access opening and an open position for opening the tape access opening, the circular arc including a predetermined radius thereof from a second center of rotation, a position of the first center of rotation in a direction of insertion of the cartridge substantially coinciding with a position of the second center of rotation in the cartridge insertion direction, and
• wherein the tape drive includes an opening member which is capable of operably engaging with the tape cartridge at a time of insertion of the tape cartridge.