The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1992
Filed:
Sep. 28, 1990
Applicant:
Inventor:
John E Bish, Tucson, AZ (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ; G06F / ;
U.S. Cl.
CPC ...
371 216 ; 371 671 ;
Abstract
An optical disk has four copies or sets of its control data structures. The control data structure includes a disk definition structure DDS, a primary defect list PDL, and a secondary defect list SDL. Procedures are described for checking to whether or not all copies of the data structures have congruence. If not, all the tables are then made congruent and re-recorded on a disk. In the procedure, the copy having the greatest number of entries is first examined for determining whether or not congruence is possible. If congruence is not possible from the longest copy, then the next longest copy is used.