Patent ID: 6128388
Filing Date: 2000-10-03
Classification: G06K,G11B

Abstract:
An optical disk comprising a plurality of sections (T.sub.1, T.sub.2, T.sub.3, . . . ) having a width of T, whereinsaid sections (T.sub.1, T.sub.2, T.sub.3, . . . ) have a width of T respectively and are formed in a circumferential direction in such region where main information is not recorded,a predetermined number corresponding to sub information, of said sections (B.sub.1, B.sub.2, B.sub.3, . . . ) are used as recording area of said sub information,a mark having stripe-like configuration in a radius direction is formed within each said section for said sub information and the width of said mark is equal to or smaller than half of said width of T.