Data storage disk with information encoded in the position error

Details Data storage disk with information encoded in the position error Data storage disk with information encoded in the position error

1998-06-16

2000-10-31

Edun, Muhammad

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, 360 75, G11B 5596

Patent

active

061411760

ABSTRACT:
There is disclosed a disk for use in a disk drive and a method for making the disk. The position error signal (PES) fields for each track on the disk are written with predetermined data, e.g. servo data, encoded thereon. In the preferred embodiment: a) the data such as the track number is mapped into codewords of an error correction code (ECC); b) bit-vectors are used to encode the symbols for further redundancy; and c) the raw data written in the PES fields is constrained to equalize the analog signal characteristic used by the servo system for positioning. Thus, the invention allows the PES fields to be used as in the prior art while also being used as a source of digital data which is robustly recorded therein. In one aspect of the invention, the track ID's are written in the PES fields in a selected pattern in which the track ID for each track is recorded in two PES field groups. One of the two PES field groups is centered on the selected track while the other PES field group is offset so that it partially overlaps the adjacent track, as well as the selected track. The PES fields will typically be recorded on the disk at the time of manufacture and not changed thereafter.

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IBM TDB, vol. 33, No. 3B, Aug. 1990, "Quad Burst Servo Needing No Sync ID and Having Added Information", pp. 198-200.
USPTO Serial No. 08/628,217, "Disk Drive Servo Sensing Gain Normalization and Linerization", pending.
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IBM TDB, vol. 32, No. 6A, Nov. 1989, "Digital Encoding Scheme With Error Detection". Pp. 275-276.
IBM TDB. vol. 29, No. 8, Jan. 1987, "Disk File Phase-Encoded Sector Servo Pattern With Data and Reference Fields in Each Sector". Pp. 3697-3699.

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