Apparatus for and method of mounting disks having different diameters

An apparatus for mounting disks having different diameters, the apparatus comprising:

• a recording medium mount section for mounting a disc, the disc being one of a first diameter and a second diameter, the second diameter being smaller than the first diameter;
• at least three optical detection means each for detecting presence or absence of reflected light and each including:
• an associated light emitting section which emits light through a corresponding one of at least three openings in the recording medium mount section such that the light is directed onto a surface of the mounted disc if the disc covers the corresponding opening in the recording medium mount section and is not directed onto the surface of the mounted disc if the disc does not cover the corresponding opening in the recording medium mount section, and
• an associated light receiving section which receives light reflected from the surface of the mounted disc if the disc covers the corresponding opening in the recording medium mount section and does not receive light reflected from the surface of the mounted disc if the disc does not cover the corresponding opening in the recording medium mount section,
• wherein the at least three openings in the recording medium mount section are positioned at substantially equal distances from a reference point so that at least two of the optical detection means detect light reflected from the surface of the mounted disc if the disc is of the first diameter and at most one of the optical detection means detects light reflected from the surface of the mounted disc if the disc is of the second diameter;
• and
• control means for determining whether the mounted disc is of the first diameter or the second diameter based on detection results of the at least three optical detection means.