Method for managing defective area of optical recording medium

Details Method for managing defective area of optical recording medium Method for managing defective area of optical recording medium

Filed on

2005-05-31

Date issued

2005-05-31

Examiner

Hindi, Nabil (Department: 2655)

Patent Class

Dynamic information storage or retrieval

SubClass

Condition indicating, monitoring, or testing

SubSubClass

Including radiation storage or retrieval

Type

Reexamination Certificate

Status

active

Patent number

06901041

Description

ABSTRACT:
A technology for managing a defective area of a rewritable optical recording medium is disclosed. This technology (1) returns information on a defective area to a host when the defective area is first encountered, (2) writes the data intended for the defective area to another area within the user area (also known as the data area) under the control of the control unit, (3) writes positional information about the defective area on a particular position in the data area, and (4) corrects information in the ICB with reference to the positional information about the defective area. This prevents the reduction of recording capacity otherwise caused by the use of spare areas and improves an efficiency of use of the disk in a rewritable optical recording medium. This is achieved by replacing a defective block with another block within the data area only when a defect is encountered and making a file system to manage the defective areas. This technology protects data with an effect identical to a linear replacement technique, and yet the recording capacity can be increased. Also, this technology prolongs a life time of the disk, because there is no limitation on a size of the available replacement block, permitting data writing to continue regardless of a number of defective sectors.

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patent: 61-009721 (1986-01-01), None
patent: 61-158069 (1986-07-01), None
patent: 10-21673 (1998-01-01), None

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