A data storage cartridge (14) can be removably inserted into a drive (13), so that respective connectors (52, 67) move into engagement. Two pawls (81, 82) are biased by a spring (119), and releasably lock the cartridge in its inserted position. In order to remove the cartridge from the drive, a motorized eject mechanism (221) can be actuated and effects movement of an eject member (171), which in turn disengages the pawls from the cartridge, moves the cartridge sufficiently to disengage the connectors, and positions the pawls for insertion of the next cartridge. If the motorized mechanism is not operable, a manual release can be effected by manually inserting a member (291) through an opening (261) provided in the drive housing, and using this member to manually move the eject member.