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:
Aug. 03, 1993
Filed:
Apr. 19, 1990
Eitaro Nishihara, Ootawara, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An auto changer apparatus for an optical disk, having a large number of optical disks which are contained in a shelf, and one of which is selected and picked up by an arm mounted at a disk installment unit, and is installed in a disk drive unit, includes a defect control memory and a directory memory. The defect control memory stores defect control data of each optical disk as a table. Upon an initial operation. initial defect control data is transferred from a control block of the optical disk to the defect control memory, and an initial defect control table is made. If a defective block is found in a write mode or a read-after-write mode, data associated with the defective block is stored in the defect control memory, and the defect control table is updated. The directory memory stores a correspondence table of a logical address of the auto changer apparatus and a physical address of each disk. The auto changer apparatus performs a pre-process such a substitute processing for a defective block and making of a directory in accordance with the data in the defect control table and the data in the directory memory upon access to the disk.