Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2011-03-08
2011-03-08
Baderman, Scott T (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
Reexamination Certificate
active
07904750
ABSTRACT:
A system and method identifies and masks physical sectors where the errors encountered during the defect scan exceed a predetermined level. This avoids the need to read and process all the data written to an individual sector during the initial defect scan. This method first writes a predetermined pattern such as a 2-T pattern to the magnetic media available for user data. This written pattern is then read. As the pattern is read, an error result increments or decrements a counter based on the error. The counter reaching a predetermined level signifies that there are too many errors in this physical sector. This sector may then be added to the primary defect list and masked out without reading the remaining written pattern within the sector. This will result significant time savings as physical sectors containing multiple errors are identified without process all the information written to the physical sector. The primary defect list is used during the low-level format to map logical locations to physical locations.
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TDB-ACC-No. NN7407495 , Disclosure Title: Disc File Defect Screening System. Jul. 1974. Publication-Data: IBM Technical Disclosure Bulletin, Jul. 1974, US, vol. No. 17, Issue No. 2, p. 495-497.
Mead John P.
Southerland Bobby Ray
Baderman Scott T
Broadcom Corporation
Garlick & Harrison & Markison
Leibovich Yair
Rudnick Holly L.
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