Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-10-16
1987-02-10
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360135, G11B 556, G11B 2336
Patent
active
046427090
ABSTRACT:
The invention discloses a twin track servoing method and apparatus useful for vertical magnetic media recordings. Vertical magnetic media are those in which the magnetic vector in the medium is oriented perpendicular to the surface of the medium instead of lying laterally or longitudinally in the surface of the medium. There are two servo tracks of essentially constant and opposite magnetic polarity recorded on the vertical magnetic medium for each data channel on the medium. The servo tracks themselves may be segmented into reference zones and control or guard zones and they may be recorded on a dedicated surface of a magnetic medium or on the same surface as the data and interleaved with data tracks. When the servo tracks are alternated with data tracks on the same surface of the medium, a single read/write head for twin track recordings may be used to simultaneously read servo signals and data signals. When the servo tracks are recorded in a dedicated sector or on another surface of the medium, the data track space between the two servo tracks can contain system control data that is normally included in the data tracks of the main data portion, thus freeing additional space in the data tracks of the main data area for additional data.
REFERENCES:
patent: 4395742 (1983-07-01), Ostroff
IBM Technical Disclosure Bulletin, vol. 20, No. 7, Dec. 1977, p. 2820, Recording Medium with Discrete Alternate Track Differing Coercive Force, A. S. Hoagland.
Duffield Edward H.
International Business Machines - Corporation
Stellar George G.
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