Disk cartridge device operative with disk cartridges of different sizes and height

A disk cartridge device comprising:

• a plurality of disk cartridges arranged such that disks of different disk diameters are housed within cartridge housings of different sizes;
• a recording and reproducing device on which said plurality of disk cartridges of different sizes are loaded selectively;
• pairs of positioning pins having height-determining bases by which said disk cartridges of different sizes are respectively properly positioned on said recording and reproducing device;
• and
• positioning holes bored on one surface of each of said disk cartridges of different sizes which engage with said pairs of positioning pins to thereby be properly positioned, wherein the disk cartridge of the large disk diameter includes escape holes formed on its lower surface to enable said disk cartridge of the large disk diameter to escape from the positioning pins at which the disk cartridge of the small disk diameter is placed properly under the loading condition that the positioning holes of the disk cartridge of the large disk diameter is fitted into said positioning pins an, d thereby the disk cartridge of the large diameter is located at the position of proper height.