Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-03-01
1993-04-13
Smith, Jerry
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, G11B 5596
Patent
active
052028020
ABSTRACT:
Methods for writing and detecting servo positioning dibit transitions on a magnetic data surface having circular tracks with two magnetic polarizations, the transitions each having a radial extent greater than the spacing between adjacent centerlines. The transitions are written by first prepolarizing the magnetic surface to a first polarization and then writing a second polarization followed by a first polarization and not writing when the write head passes a previously written transition in an adjacent track. The transitions are detected by qualifying the detection means when the sensed servo signal exceeds a threshold amplitude corresponding to a first polarization and detecting the crossing by the sensed servo signal of a second threshold corresponding to the transition to a second polarization.
REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3691543 (1972-09-01), Mueller
patent: 3818502 (1974-06-01), Chien et al.
patent: 3893180 (1975-07-01), Braun et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4027338 (1977-05-01), Kril
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4052741 (1977-10-01), Baca et al.
patent: 4068268 (1978-01-01), Idemoto et al.
patent: 4072990 (1978-02-01), Case et al.
patent: 4101942 (1978-07-01), Jacques
patent: 4115823 (1978-09-01), Commander et al.
patent: 4149200 (1979-04-01), Card
patent: 4172267 (1979-10-01), Sidman
patent: 4238809 (1980-12-01), Fujiki et al.
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4326226 (1982-04-01), Touchton et al.
patent: 4377827 (1983-03-01), Rose
patent: 4424543 (1984-01-01), Lewis et al.
IBM Tech. Disc. Bull., vol. 18, No. 10, Mar. 1976, pp. 3424-3425 Oswald, "Track Following Servo System".
IBM Tech. Disc. Bull., vol. 19, No. 7, Dec. 1976, pp. 2686-2687 Brownback et al., "Measuring and Adjusting Speed of Magnetic Disk Access Arm".
IBM Tech. Disc. Bull., vol. 20, No. 8, Jan. 1978, pp. 3243-3247 Deremer et al., "Sector Servo Method".
IBM Tech. Bull., vol. 21, No. 2, Jul. 1978, pp. 804-805 Herrington et al., "Quad-Burst PES System for Disk File Servo".
Digital Equipment Corporation
Garland Steven R.
Smith Jerry
LandOfFree
Methods of writing and detecting dibit servo encoding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods of writing and detecting dibit servo encoding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of writing and detecting dibit servo encoding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1159540