Disk reproduction apparatus and method for high speed...

G - Physics – 11 – B

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352/33.11, 352/3

G11B 21/08 (2006.01) G11B 7/085 (2006.01) G11B 19/02 (2006.01) G11B 27/10 (2006.01) G11B 27/11 (2006.01) G11B 27/30 (2006.01) G11B 27/32 (2006.01)

Patent

CA 1308191

ABSTRACT OF THE DISCLOSURE When receiving address data of a target position from a host computer, a control unit reads the present address data of a pick-up using a subcode Q detector or a header detector. The control unit computes a difference between the present address data as read out and the address data of the preceding frame (one block) already read out and stored in RAM. The control unit then checks if the difference is within a preset value. If it is, the control unit decides that the present address data is correct, and uses it in the data access operation. If it is not, the control unit computes a difference between the address data at the target position as specified by the host computer and the present address. The control unit then checks if the difference is within a preset value. If it is, the present address data is correct it is used, in the data access operation.

573661

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