Auto changer apparatus with a defect control memory

Details Auto changer apparatus with a defect control memory Auto changer apparatus with a defect control memory

1990-04-19

1993-08-03

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 48, 369 32, 360 69, G11B 700, G11B 1518

Patent

active

052335917

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.

REFERENCES:
patent: 4827462 (1989-05-01), Flannagan et al.
patent: 4835757 (1989-05-01), Abiko
patent: 4924331 (1990-05-01), Robinson et al.
patent: 4953122 (1990-08-01), Williams
patent: 4984230 (1991-01-01), Satoh et al.
patent: 5025432 (1991-06-01), Naito
patent: 5068842 (1991-11-01), Naito

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