Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-01-17
1991-12-17
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360135, G11B 5596
Patent
active
050738348
ABSTRACT:
A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal increase in overhead (non-data) regions. The tracks on the medium are divided into a plurality of maxi sections, each of which contains all fields with servo and associated overhead information and also a data field. At least one micro servo section containing only a portion of said information is located within each data field.
As each micro servo section passes by an associated recording head, writing and reading of data is temporarily interrupted, but resumed when the micro servo section moves beyond the head, in such manner as to require minimal resynchronization of said data during reading.
Using a phase continuous clock, data is written in both portions of a data field to either side of each micro servo section in one pass of the disk or tape relative to the head. The micro servo sections contain no timing reference address mark and require no data encoder/decoder flush or synchronization byte to resume reading in the portion of the data field following each micro servo section.
REFERENCES:
patent: 4424543 (1984-01-01), Lewis et al.
B. Smith, "Servo Zones Embedded in Data Tracks Solve Old, But Create New Problems" Computer Technology Review Spring 1988 pp. 45, 46 & 48.
IBM Technical Disclosure Bulletin vol. 25, No. 2 Jul. 1982 pp. 776-777 "Dicell Gray Coding of Disk File Track Addresses" D. H. Pennington.
Best John S.
Hetzler Steven R.
Kabelac William J.
Thompson David A.
International Business Machines - Corporation
Otto, Jr. Henry E.
Psitos Aristotelis
Robertson David L.
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