Patent ID: 6615363
Filing Date: 2003-09-02
Classification: G11B

Abstract:
An optical disk formatted to have:a record management area in which management information can be stored and of which the contents cannot be rewritten by the user; a data area to which the user can make access; and a replacement area capable of providing replacement blocks for defective blocks that exist in said data area, said record management area being provided at three or more different locations on said optical disk so that different contents of said management information can be respectively stored in said management areas located at the different locations, wherein said management information stored in said record management areas have first management information including a recording system for all said disk, and second management information including address information of both said defective blocks and said replacement blocks, and said record management areas have first management areas located adjacent the innermost and outermost peripheries of said optical disk to store said first management information, and a second management area located between said innermost and outermost peripheries of said optical disk to store said second management information.