Dynamic magnetic information storage or retrieval – General recording or reproducing
Patent
1991-08-13
1993-12-28
Zazworsky, John
Dynamic magnetic information storage or retrieval
General recording or reproducing
360 75, 360 7702, 360 7708, 360135, G11B 502, G11B 5596
Patent
active
052745112
ABSTRACT:
An external position detector is mounted on a head arm that also carries a transducer for tracking a magnetic disk. When the head arm is moved at constant speed, the position detector produces an output signal that is periodic but has a measurable pitch error or pitch unevenness. The periodic output signal is measured to determine the pitch error, and an amount of compensation required to compensate for the measured pitch error is calculated. A value of the periodic output signal corresponding to the amount of compensation and therefore corresponding to an absence of pitch error is calculated, and a servo signal is recorded on the magnetic disk at a location corresponding to the calculated value of the periodic output signal. The pitch error is thereby fully compensated, and the servo signal is recorded with precision.
REFERENCES:
patent: 4488187 (1984-12-01), Alaimo
patent: 4590527 (1986-05-01), Warner
patent: 4835632 (1989-05-01), Shih et al.
patent: 4878135 (1989-10-01), Makino et al.
patent: 4974109 (1990-11-01), Hoshimi et al.
patent: 5027233 (1991-06-01), Berti et al.
patent: 5051851 (1991-09-01), Sakurai
patent: 5140476 (1992-08-01), Kim
patent: 5162955 (1992-11-01), Burdenko
patent: 5165082 (1992-11-01), Tomiyama
"Method to Measure the Amount of Off-Track" IBM Tech. Disclosure Bulletin vol. 31 No. 2 Jul. 1988 pp. 269-270.
Patent Abstracts of Japan, vol. 13, No. 85 (P-834) (3433) Feb. 27, 1989 & JP-A-63 266 625 (Mitsubishi) Nov. 2, 1988, abstract.
Patent Abstracts of Japan, vol. 12, No. 383 (P-770) Oct. 13, 1988 & JP-A-63 127 416 (Sony) May 31, 1988, abstract.
Patent Abstracts of Japan, vol. 12, No. 417 (P-782) Nov. 7, 1988 & JP-A-63 154 916 (Sony) Jun. 28, 1988, abstract.
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
Zazworsky John
LandOfFree
Servo signal recording method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Servo signal recording method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Servo signal recording method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1547601