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. 25, 1985
Filed:
Oct. 26, 1982
Masafumi Nozawa, Minami-ashigara, JP;
Michio Miyazaki, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed is a control method for writing or reading sequentially a plurality of blocks of data for a storage device using a recording medium, such as a photo disk, with a number of recording blocks each having a unique address. In writing data, a plurality of data blocks to be written concurrently are given in their pointer fields the first address indicating the same alternative block, and these data are written in consecutive recording blocks on the recording medium. If blocks with write errors are detected, the data blocks corresponding to the error blocks are written sequentially in an alternative area starting from the first address, after replacing the pointer fields with the second address indicating the defective blocks, respectively. This allows the access of the alternative blocks for defective blocks by detecting the pointer address within the pointer fields of normal blocks preceding and following each of the defective blocks during the data reading operation.