Structure for preventing misinsertion of disc cartridges

A drive adapted for a first cartridge with a recording medium of first format and an inclined corner and for a second cartridge with a recording medium of second format and a groove formed in a corner of the second cartridge corresponding to said inclined corner of said first cartridge and being different in shape from said inclined corner, said drive comprising:

• a cartridge holder, said cartridge holder holding and moving either of the first cartridge and the second cartridge between an insertion position and a loading position;
• a lifting member for lifting the cartridge holder;
• a misinsertion preventing member rotatably mounted to said cartridge holder, said misinsertion preventing member being formed with a protrusion;
• and
• biasing means for biasing said misinsertion preventing member to rotate in a first direction,
• wherein when inserting in the drive the first cartridge in a normal position, said protrusion of said misinsertion preventing member is engaged with the inclined corner of said first cartridge to rotate said misinsertion preventing member in a second direction against said biasing means to allow loading of the first cartridge into the drive;
• and
• wherein when inserting in the drive the second cartridge in a normal position, said protrusion of said misinsertion preventing member is inserted in the groove to allow loading of the second cartridge into the drive.