Method and apparatus for servo control with error detection of g

Details Method and apparatus for servo control with error detection of g Method and apparatus for servo control with error detection of g

1995-03-02

1997-04-01

Beausoliel, Jr., Robert W.

G06F 1100

Patent

active

056175361

ABSTRACT:
Logic for detecting the reliability of an address in Pennington code (PCODE). The address is parsed into two separate halves. The first half corresponds to the front portion of the PCODE address and the second half corresponds to the back portion of the same. The two halves are compared to determine the reliability of the address. If the address is not reliable, a head position estimation is used to position the head over the described track. If the address is reliable, the PCODE is combined with a position error signal to position the head.

REFERENCES:
patent: 4914644 (1990-04-01), Chen et al.
patent: 5274510 (1993-12-01), Sugita et al.
D.H. Pennington, "Dicell Gray Coding of Disk File Track Addresses", IBM Technical Disclosure Bulletin, vol. 25, No. 2, Jul. 1982, pp. 776-777.
M. Kisaka et al., "Improved Gray Code Pattern on a Hard Disk", IBM Technical Disclosure Bulletin, vol. 35, No. 4B, Sep. 1992, pp. 373-374.
Y. Kigami, et al., "Sector Address in Gray Code Area", IBM Technical Disclosure Bulletin, vol. 37, No. 02B, Feb. 1994, p. 565.

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