Patent ID: 6510026
Filing Date: 2003-01-21
Classification: G11B

Abstract:
A recording medium cartridge, comprising:a disk-shaped recording medium rotatable about a central axis and having a hub at a central region thereof, said hub having at least one projection that engages with a concavity provided in a rotor of an apparatus that reads data from and writes data to the recording medium when the recording medium cartridge is fully inserted therein, said hub being movable in a direction, perpendicular to a bottom surface of said recording medium, said at least one projection being radially offset from a center of said hub by a predetermined distance; a case housing said recording medium; and a window that exposes part of the recording medium through a bottom surface of said case when the recording medium cartridge is inserted in an apparatus that reads data from and writes data to the recording medium, said bottom surface of said case defining a bottom plane of said case that is orthogonal to said central axis, wherein said recording medium cartridge is configured in such a manner that, when said recording medium cartridge is fully inserted in an apparatus that reads data from and writes data to said recording medium and said apparatus rotates said recording medium about said central axis via said hub, said at least one projection of said hub projects below said bottom plane of said case.