Disc shaped recording medium having a zero track address and mul

Details Disc shaped recording medium having a zero track address and mul Disc shaped recording medium having a zero track address and mul

1993-01-27

1994-09-13

Shepperd, John

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

360 59, 3692753, G11B 1722, G11B 502, G11B 370, G11B 584

Patent

active

053472071

ABSTRACT:
A recording medium in the form of a disc in which locations on said disc 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 of the disc is smaller than the number of addresses necessary for the radially outer region 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 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 of the disc. In this manner, the totality of the tracks may be represented while maintaining interchangeability with the conventional discs even although the track pitch is smaller than in the case of conventional discs. Besides, the address discrimination may also be facilitated.

REFERENCES:
patent: 4523304 (1985-06-01), Satoh et al.
patent: 4630252 (1986-12-01), Miura et al.
patent: 4677603 (1987-06-01), Kenjyo
patent: 4736352 (1988-04-01), Saxon et al.
patent: 4847708 (1989-07-01), Furuyama
patent: 5151891 (1992-09-01), Bergmans

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