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Adjustable Total Write Error Recovery Procedure Steps

IP.com Disclosure Number: IPCOM000118813D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Andoh, H: AUTHOR

Abstract

Disclosed is a method to realize reassignment of Write Hard Error as soon as possible without degrading data transfer rate, but not to make Reassign Defect Table (RDM) full with reassignment of Write Hard Error by changing the total Write Error Recovery Procedure (ERP) steps, according to the usage ratio of the RDM.

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Adjustable Total Write Error Recovery Procedure Steps

      Disclosed is a method to realize reassignment of Write Hard
Error as soon as possible without degrading data transfer rate, but
not to make Reassign Defect Table (RDM) full with reassignment of
Write Hard Error by changing the total Write Error Recovery Procedure
(ERP) steps, according to the usage ratio of the RDM.

      Write ERP is repeated by fixed ERP steps.  Therefore, in order
to allow the loop count to be changeable, it can adjust total Write
ERP steps.  The Figure shows an example of the relation between write
ERP loop count and usage ratio of RDM.  If the usage ratio is 55%,
the write ERP loop count is set 2, and the total ERP steps will be 60
(Assumption: fixed ERP steps is 20).

This method is not only for Write ERP but can adapt to Read/Seek ERP.