Patent ID: 6198717
Filing Date: 2001-03-06
Classification: G11B,H04N

Abstract:
A disc-shaped record medium for storing digital information in a succession of substantially circular and concentric recording tracks, wherein each recording track includes a succession of alternating marks and spaces, lengths of successive marks and spaces being modulated in accordance with information to be recorded, the digital information derived from a succession of multi-bit binary code blocks, said digital information being converted to a succession of output pulses having discretely-variable time durations, wherein the lengths of the succession of marks and spaces are modulated in discrete steps in accordance with the discrete lengths of the succession of said output pulses to form said code blocks, and wherein said record medium includes information thereon which is indicative of a particular location of said information on the record medium;wherein said record medium is divided into sectors, each including a defined amount of information therein, each sector including an associated header portion which includes said information which is indicative of the particular location of said each sector on the record medium, said information including an address in said header indicative of its associated sector; andwherein each said sector includes a fixed amount of data.