Real time media defect scanning in a sampled amplitude read chan

Details Real time media defect scanning in a sampled amplitude read chan Real time media defect scanning in a sampled amplitude read chan

1994-11-17

1996-10-08

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 65, G11B 509, G11B 5035

Patent

active

055637469

ABSTRACT:
A real time defect scanning system integrated into a sampled amplitude read channel for detecting defects in a magnetic storage medium using a discrete time filter having an impulse response substantially matched to an error signature in a read back signal caused by a defect in the medium. The scanning system operates by writing a predetermined bit sequence to the storage device and detecting medium defects upon read back. In a sinusoidal read signal mode, a discrete time notch filter removes the fundamental frequency so that any remaining sidebands indicate a media defect. The discrete time defect filter enhances the signal so that a defect can be detected with a discrete time energy detector. The impulse responses of the notch filter and defect detection filter are programmable in order to adapt the defect scanning system to a particular disk drive, data density, or magnetic media.

REFERENCES:
patent: 5392295 (1995-02-01), Coker et al.
patent: 5410439 (1995-04-01), Egbert et al.
patent: 5424881 (1995-06-01), Behrens et al.
J. D. Coker, R. L. Galbraith, G. J. Kerwin, "Magnetic Characterization Using Elements of a PRML Channel", IEEE Transactions on Magnetics, vol. 27, No. 6, pp. 4544-4548, Nov. 1991.
W. Don Huber, "Single-Pass Flaw Detector for Magnetic Media", IEEE Transactions on Magnetics, vol. 30, No. 6, pp. 4149-4151, Nov. 1994.

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