Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1990-07-12
1993-03-09
Dixon, Joseph L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 7708, 360135, G11B 2730
Patent
active
051930340
ABSTRACT:
A constant-density type of magnetic disk apparatus is made up of a plurality of magnetic disks, wherein at least one of the surfaces of the magnetic disks is a servo face divided into a plurality of zones in the radial direction of the disks. A magnetic disk used in this apparatus and a servo-writing device for making this magnetic disk are also disclosed. In the magnetic disk apparatus and the magnetic disk, servo information regions and clock information regions are alternately provided on the servo face in the circumferential direction of the disks. The servo information regions are arranged radially with respect to the rotation center of the disks and each of the clock information regions includes a plurality of magnetic transitions representative of clocks, the number of which is different for each of the divided zones. A servo PLL circuit is provided to generate a servo clock signal on the basis of the signal reproduced from each of the servo information regions, and a write PLL is also provided to generate a write clock signal on the basis of the signal reproduced from each of the clock information regions. Also disclosed is a disk for use in a constant density-recording type magnetic disk apparatus, wherein a dummy track is provided along a zone boundary on the data face embedded with servo patterns of the disk.
REFERENCES:
patent: 4016603 (1977-04-01), Ottesen
patent: 4714967 (1987-12-01), Bizjak
patent: 4918677 (1990-04-01), Ashinuma et al.
Electronics Design, Nov. 13, 1986, pp. 141-144.
Aoi Hajime
Saito Makoto
Seo Yosuke
Tsuyoshi Toshiaki
Dixon Joseph L.
Hitachi , Ltd.
Robertson David L.
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