Track-on-data technique and associated system involving di-bit r

Details Track-on-data technique and associated system involving di-bit r Track-on-data technique and associated system involving di-bit r

1977-06-16

1979-08-28

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 21, G11B 556, G11B 2110

Patent

active

041662822

ABSTRACT:
Techniques and associated apparatus for positioning a magnetic transducer system relative to a selected recording track on a magnetic recording disk.
Record information (computer data bits) is recorded along one or more information zones (tracks) of the disk and head-positioning information is derived from this according to a novel "track-on-data" scheme. This scheme uses a "di-gap" transducer system comprising at least one related pair of transducer gaps aligned to register and sense information along a common record track, with the gaps being skewed oblique to the track direction, and aligned transverse to one another.
"Servo-bits" (providing head positioning information) and "work-bits" may both be recorded along a given track, these bits, like the mentioned gaps, being skewed relative to the track direction and aligned transverse to one another; the servo-bits in any one track thus being aligned parallel to one of the gaps while the companion work-bits are parallel to the other gap -- these gaps however being functionally interchangeable, with neither gap being dedicated to servo data or work data.
Thus, once the di-gap head is moved along a given track, one gap will be aligned with the servo-bits and the other with the work-bits -- the two gaps being adapted to generate respective servo signals and data signals, the servo signal values (phase) automatically indicating the degree of head registration. Preferably, a related data encoding scheme establishes, for each track, the orientation of work-bits and servo-bits.

REFERENCES:
patent: 2929670 (1960-03-01), Garrity
patent: 2938962 (1960-05-01), Konins et al.
patent: 3185972 (1965-05-01), Sippel
patent: 3665118 (1972-05-01), Cooper, Jr.
patent: 3678220 (1972-07-01), Luhrs
patent: 3686649 (1972-08-01), Behr
patent: 4007493 (1977-02-01), Behr et al.
patent: 4074328 (1978-02-01), Hardwick

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