G - Physics – 11 – B
Patent
G - Physics
11
B
352/32, 352/21.2
G11B 27/32 (2006.01) G11B 7/085 (2006.01) G11B 21/08 (2006.01)
Patent
CA 1213977
ABSTRACT OF THE DISCLOSURE Sector marks are selectively placed in each coarse servo track of a rotating disk. These concentric coarse seek tracks, pre-written on the disk, are used by a servo system for the positioning of the read/write mechanism. Coarse track read means simultaneously sense at least two adjacent coarse seek tracks. Detection means sense the relative position of these coarse seek tracks within the sensing range of the coarse track read means, and this position information is used by the servo system to selectively control the radial position of the coarse track read means with respect to the rotating disk. The sector marks written in the coarse seek tracks are likewise detected, and a signal is produced indicating when each sector begins and ends. An oscillator is locked to this sector signal such that a fixed number of cycles of the oscillator signal corresponds to the passage of one sector of the disk under the coarse track read means. A counter is then used to count the appropriate number of cycles. An index mark, representing a zero degree reference point, is also placed in the coarse seek track. When sensed, the index mark resets the counter. The count contained in the counter thus always indicates the rotational position (sector location) of the disk.
448976
Smart & Biggar
Storage Technology Partners II (through Stc Optical Disk Develop Managing General Partner)
LandOfFree
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