Patent ID: 6181664
Filing Date: 2001-01-30
Classification: G11B

Abstract:
A disk apparatus for use in a disk cartridge system including different types of disk cartridges, the disk cartridge system having a first disk cartridge and a second disk cartridge;wherein the first disk cartridge includes a first case having a substantially rectangular shape with first, second, third and fourth edges, the first edge of the case being delimited by a first corner portion connecting the first edge and second edge and a second corner portion connecting the first edge and the third edge, the first case having a first groove in both of the second and third edges and extending along at least a portion of the second and third edges, respectively, and a first disk being housed in the first case;wherein the second disk cartridge includes a second case having a substantially rectangular shape with fifth, sixth, seventh and eighth edges, the fifth edge of the second case being delimited by a fifth corner portion connecting the fifth edge and sixth edge and a sixth corner portion connecting the fifth edge and the seventh edge, the second case having a second groove located in only one of the sixth and seventh edges and extending along a portion of the only one of the sixth and seventh edges, and a second disk being housed in the second case;wherein a length, width and thickness of the first case are substantially equal to a length, width and thickness of the second case; andwherein a diameter and thickness of the first disk are substantially equal to a diameter and thickness of the second disk;the disk apparatus comprising a discrimination arrangement which discriminates the groove, and the discrimination arrangement including a projection located at a position and having a shape corresponding to the groove.