Patent ID: 6563776
Filing Date: 2003-05-13
Classification: G11B

Abstract:
An information storage apparatus adapted to store information on a recording medium having a plurality of recording zones, each of the recording zones being divided into a plurality of sectors, a substitutional area being defined in each of the recording zones to substitutionally store information when an error occurs in storing the information, said information storage apparatus comprising:a defective sector detecting unit detecting a defective sector in each of the recording zones; and a control unit controlling an operation for storing information so as to store the information, when a number of defective sectors included in a first one of the recording zones is greater than a predetermined value, in the substitutional area of a second one of the recording zones other than the first one of the recording zones in which the information is to be stored; wherein the predetermined number is smaller than a maximum number of defective sectors includable in the substitutional area.