Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1993-03-03
1995-02-07
Pascal, Robert J.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 48, 369 54, 369124, 360 50, 360 51, 360 53, 360 48, G11B 1722
Patent
active
053880854
ABSTRACT:
Apparatus and method are provided to increase the capacity of spiral track data storage disks while improving the reliability of access to sectors on the disk by permitting previously unusable sectors immediately following a band boundary to be reliably accessed. In accordance with the present invention, an optical drive controller is provided having a clock for generating a clock signal with a frequency of f.sub.N and a cycle slipper for generating a slipped clock signal with a frequency of f.sub.N-1 from the clock signal. The controller also includes a device for enabling the slipper when an optical head is positioned opposite a sector in a band N-1 during a seek operation to a target sector in band N, and for disabling the slipper when the optical head is positioned opposite the end of the last sector in band N-1. Thus, identification information pertaining to sectors in band N-1 is processed at a data transfer rate of f.sub.N-1 and the data transfer rate is switched to f.sub.N with only an insignificant delay, permitting the first several sectors in band N to be used. Embodiments of the present invention include the use of full-cycle slipping and half-cycle slipping.
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International Business Machines - Corporation
Kinkead Arnold
Pascal Robert J.
Shifrin D. A.
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