Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1978-02-28
1979-07-31
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, 360135, G11B 2110, G11B 512
Patent
active
041632656
ABSTRACT:
A magnetic disc memory having a device for positioning a magnetic head on a track. A disc is sub-divided into sectors comprising groups of data tracks and, alternating therewith, sectors having groups of servo tracks which define the data tracks which are staggered over one half track pitch with respect thereto. Each servo track includes magnetization changes (reference transitions) for reference purposes. Magnetization changes for position detection purposes (measuring transitions) are present in the servo sectors, stepwise from track to track per group of servo tracks. Said stepwise magnetization changes are of alternating polarity from track to track. An additional transition is provided every other servo track in the vicinity of the reference transitions. A stepwise organization of the magnetization changes in two longitudinal directions of the servo tracks enables the number of tracks per group to be substantially doubled.
REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3812533 (1974-05-01), Kimura et al.
IBM Tech. Disc. Bull., Bush et al., Magnetic Head Position Sensing, vol. 16, No. 5, Oct. 1973, pp. 1379-1380.
IBM Tech. Disc. Bull., R. K. Oswald, Continuous Position Error Signal for Access Control System, vol. 19, No. 2, Jul. 1976, pp. 679-680.
Pulle Duco W. J.
van Herk Alfred
Briody Thomas A.
Cannon, Jr. James J.
Connors, Jr. Edward J.
Eddleman Alfred H.
U.S. Philips Corporation
LandOfFree
Magnetic disc memory and magnetic disc for this memory does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic disc memory and magnetic disc for this memory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic disc memory and magnetic disc for this memory will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-24992