Scheibenförmiges Aufzeichnungsmedium und Adressenunterscheidungsschaltung dafür

摘要

A recording medium in the form of a disc (D) in which locations on said disc (D) other than a predetermined location set as a zero- address are represented by (+) side addresses and (-) side addresses with respect to the zero address, and in which the information concerning these addresses are at least recorded as address data constituted by N bits. With the disc-shaped recording medium the fact that the number of addresses necessary for the radially inner region (ARin) of the disc is lesser than the number of addresses necessary for the radially outer region (ARout) of the disc is utilized in such a manner that the upper four bits of 16 bits are used in the manner of sign bits for representing the addresses on the radially inner side (ARin) of the disc, with the remaining bits being used for representing the addresses, with the 16 bits inclusive of the upper four bits being used for representing the addresses for the radially outer region (ARout) of the disc (D). In this manner, the totality of the tracks may be represented while maintaining interchangeability with the conventional discs even although the track pitch is lesser than in the case of conventional discs. Besides, the address discrimination may also be facilitated.