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:
Jun. 20, 1989
Filed:
Mar. 11, 1985
Tatuo Sugimura, Yawata, JP;
Isao Satoh, Neyagawa, JP;
Yoshihiko Imai, Hirakata, JP;
Makoto Ichinose, Sakai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An information recording and reproducing apparatus for recording information on the recording medium and reproducing the information from the recording medium has a data recording region of a sector structure in which the region is divided into a plurality of sectors. There are provided means for designating alternate sector to be used in place of a defective sector and means for adding to data a logical address of a sector where the data is to be recorded. Reproduction from the sector where the desired data is recorded can be accomplished by using only a physical address without being influenced by difference between the physical address and the logical address brought about by the occurrence of the defective sector.