Method for managing information on a storage media without losin

Details Method for managing information on a storage media without losin Method for managing information on a storage media without losin

1988-12-14

1991-04-02

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

371 216, G11B 700

Patent

active

050051652

ABSTRACT:
A magneto-optic storage media is provided with two defect information blocks for storing information concerning a defect. At the time of reproduction, both the blocks are read, and it is determined whether or not the reading operation is normal. If the reading operations of both the blocks are normal, it is determined which of the respective numbers= of registrations of the information concerning a defect stored in both the blocks is larger so that the block in which the number of registrations is larger is utilized. Then, the defect information in the block which was not employed is updated and registered with the defect information. if the defect information is not registered, the block is switch so that an updating and registering operation can be executed again.

REFERENCES:
patent: 4498146 (1985-02-01), Martinez
patent: 4631723 (1986-12-01), Rathbun et al.
patent: 4835757 (1989-05-30), Abiko
Article: Interface; published in May, 1984; Hirotaka Oshima.
IBM Technical Disclosure Bulletin, vol. 27, No. 10A, Mar. 1985; "Method for Tracking Embedded Defective Disk or Diskette Sectors", p. 5604.
IBM Technical Disclosure Bulletin, vol. 29, No. 5, Nov. 1986; "Method to Manage Sector Defects", pp. 2607-2608.
IBM Technical Disclosure Bulletin, vol. 26, No. 10B, Mar. 1984; "Soft-Sectored Hard File Defective Sector Mapping", pp. 5769 to 5770.
The English Abstract of Japanese Patent No. 60-74158 dated Apr. 26, 1985.
The English Abstract of Japanese Patent No. 61-32266 dated Feb. 14, 1986.

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