Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-03-10
1991-10-08
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77070, G11B 5596
Patent
active
050559516
ABSTRACT:
The specification discloses a method and apparatus for servo-positioning moveable transducer heads and the like by means of time-based servo system utilizing a particular type of servo pattern or format recorded on a data storage member, e.g., magnetic tape or disk, and having first and second sets of servo lines that extend angularly across the recording media from opposite sides thereof convergently toward one another. The individual lines in each such set of recorded servo information extend alongside one another without intersecting, and in a preferred embodiment the two sets of servo lines intersect along a medial portion of the recording media, to define a uniform series of angles disposed adjacent one another along the recording member, a preferred such pattern having a chevron-like appearance. The overall servo pattern formed by the two sets of servo lines preferably extends across substantially the entire usable surface of the recording media to provide continuous servo-positioning. Data is written over the same surface as the servo pattern, preferably by recording each different type of information in different levels of the recordable media, and preferably at a substantial difference in azimuth angle, whereby read-write isolation between the servo and data is further achieved. The specification also discloses a calibration means comprising a separately-recorded parallel information track by which any offset present between the servo heads and the data heads of individual drives may be determined and utilized in read-write operations to insure complete accuracy in tracking.
REFERENCES:
patent: 4007493 (1977-02-01), Behr et al.
patent: 4321634 (1982-03-01), Lehureau
patent: 4347534 (1982-08-01), Kimura
patent: 4587579 (1986-05-01), Cocke et al.
patent: 4823205 (1989-04-01), Hannon et al.
Irwin Magnetic Systems, Inc.
Psitos Aristotelis
Robertson David L.
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