Disk cartridge having identification element and disk drive apparatus which recognizes the identification element

A disk cartridge to hold a disk, comprising:

• a case into which a disk is received;
• and
• a reflection unit disposed on a surface of the case and from which an incident beam is reflected,
• wherein the reflection unit imparts an optical property into the reflected beam which corresponds to the disk type of the disk in the case and distinguishes the disk type from additional disk types having corresponding other optical properties imparted by the reflection units associated with the additional disk types, and
• wherein the reflection unit is provided with a plurality of reflectors arranged in a recess portion on the case, and a movable lid arranged to cover a selected reflector to adjust the optical property of the reflected beam.

A disk cartridge to hold a disk, comprising:

• a case into which a disk is received;
• and
• a reflection unit disposed on a surface of the case and from which an incident beam is reflected,
• wherein the reflection unit imparts an optical property into the reflected beam which corresponds to the disk type of the disk in the case,
• wherein the reflection unit alters a wavelength of the beam to be one of a predetermined set of wavelengths, and the one wavelength corresponds to the disk type of the disk in the case, and
• wherein the reflection unit is provided with a plurality of reflectors arranged in a recess portion on the case, and a movable lid arranged to cover a selected reflector to adjust the optical property of the reflected beam.

A disk cartridge to hold a disk, comprising:

• a case into which a disk is received;
• and
• a reflection unit disposed on a surface of the case and from which an incident beam is reflected,
• wherein the reflection unit imparts an optical property into the reflected beam which corresponds to the disk type of the disk in the case,
• wherein the reflection unit comprises a reflection surface having one of a predetermined set of reflection areas, and the one reflection area corresponds to the disk type of the disk in the case, and
• wherein the reflection unit is provided with reflection areas arranged in a recess portion on the case, and a movable lid arranged to cover a reflection area to adjust the optical property of the reflected beam.