Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1983-06-15
1985-04-16
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360135, G11B 558, G11B 2110, G11B 2334
Patent
active
045119384
ABSTRACT:
A magnetizable recording disk is divided into data and servo sectors. The servo sectors include position reference information comprising a circumferentially extending and radially repeated magnetization pattern. Each such pattern comprises at least three subsets of elements from each of which a different phase of radial position error signal, indicating displacement from a data track center line, can be derived. The subsets are radially offset from each other by less than the pitch of the data tracks and their individual elements each have a radial width greater than the pitch of a data track. By making the width of the individual element of the servo pattern greater than that of the data tracks and, necessarily, greater than the physical width of the electromagnetic transducing head for reading and writing information on the disk, the contribution of neighboring elements to the signal sensed by the head via its fringing field is reduced. This results in a more linear position error signal in all regions where the head straddles the boundary between elements. A disk file comprising such a disk comprises, in addition to the electromagnetic transducing head, a head positioning actuator, position error signal generating means for generating the multiple phase position error signals and combining them into a composite signal and feedback means for feeding back the composite position error signal to control the actuator to correct for displacement of the head from a selected data track center line.
REFERENCES:
IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, Phase and Location Coded Servo Pattern for Controlling the Magnetic Head in Track Seek and Track Follow Operations, KoHo Schaller, pp. 1792-1794.
IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, Rotating Record Disk Initialization for Sector Servoing, J. C. Dennison et al., pp. 1789-1791.
IBM Technical Disclosure Bulletin, vol. 22, No. 8A, Jan. 1980, Track Servo System Compensating Pattern Defects, A. Malta et al., pp. 3269-3270.
IBM Technical Disclosure Bulletin, vol. 22, No. 12, May 1980, Quad-Burst Servo Pattern, C. C. Liu, pp. 5436-5438.
International Business Machines
Madden, Jr. Walter J.
Stellar George G.
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