AUTO CHANGER APPARATUS WITH A DEFECT CONTROL MEMORY

• Main Author: NISHIHARA; EITARO
• Format: Patent
• Language: English
• Published: 03.08.1993
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

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.