Surface analysis test with mixed ECC symbol

Details Surface analysis test with mixed ECC symbol Surface analysis test with mixed ECC symbol

2005-07-11

2008-08-26

Feild, Joseph (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

Reexamination Certificate

active

07417816

ABSTRACT:
Embodiments of the present invention provide an inspection method for detecting a physical defect of a magnetic disk with high sensitivity without increasing the length of inspection time. In a magnetic disk drive according to one embodiment, the assembling of which has been completed, by reading inspection data written to a magnetic disk, a defect of the magnetic disk is detected in a state in which a read error occurs. Redundant bits of an ECC are added to the inspection data. If a head corresponding to a recording surface to be inspected has superior read performance, an ECC 2 is applied. If the head in question has inferior read performance, an ECC 4 is applied. Accordingly, as compared with a case where a single ECC is applied, the defect detectivity is further improved without increasing the length of inspection time.

REFERENCES:
patent: 6651213 (2003-11-01), Hassner et al.
patent: 6747827 (2004-06-01), Bassett et al.
patent: 09-145634 (1997-06-01), None
patent: 2001-351228 (2001-12-01), None

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