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Enhanced error recovery procedure for reserved area

IP.com Disclosure Number: IPCOM000013573D
Original Publication Date: 2001-Jun-27
Included in the Prior Art Database: 2003-Jun-18
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Abstract

Disclosed is device firmware that new method of error recovery procedure. Current HDD products have 2 copy of firmware on disk at reserved area, master copy and backup copy. A HDD can be recovered to load firmware from backup copy even if the master copy is broken or cannot be read. But in case of seek error, it is possible it takes too much time to read for recovery, then time-out error will be occurred. This new error recovery procedure for reserved area can be reduce time to recover from the error and provide more chance to recovery. Current recovery procedure for reserved are is like this: 1. Load from master copy 2. If cannot be load from the master copy, try backup copy.

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Enhanced error recovery procedure for reserved area

Disclosed is device firmware that new method of error recovery procedure. Current HDD products have 2 copy of firmware on disk at reserved area, master copy and backup copy. A HDD can be recovered to load firmware from backup copy even if the master copy is broken or cannot be read. But in case of seek error, it is possible it takes too much time to read for recovery, then time-out error will be occurred. This new error recovery procedure for reserved area can be reduce time to recover from the error and provide more chance to recovery.

Current recovery procedure for reserved are is like this:
1. Load from master copy
2. If cannot be load from the master copy, try backup copy.

In case of seek error, it takes a lot of time until the error recovery procedure will be expired (hard error). And some of error recovery procedure is common both master and backup, especially the error was caused by head malfunction or instability. New error recovery procedure provides effective way and reduces the execution time. This new error recovery procedure consists 2 items. 1: "switch" flag in error recovery procedure table, 2: execute error recovery to both head 0 (for master copy) and head 1 (for backup copy).

1. A flag to switch head to be read from master or backup in error recovery procedure table. For example, firmware tried to read from master copy but error occurred. In this case, error recovery procedure checks the flag to...