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Dynamic Data Recovery Procedure on Hard Disk Drive

IP.com Disclosure Number: IPCOM000114945D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Tobari, A: AUTHOR [+4]

Abstract

Disclosed is a method of Data Recovery Procedure (DRP), and this is to arrange the each recovery procedure dynamically by previous recovery history. As the result, the error recovery time becomes faster.

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This is the abbreviated version, containing approximately 100% of the total text.

Dynamic Data Recovery Procedure on Hard Disk Drive

      Disclosed is a method of Data Recovery Procedure (DRP), and
this is to arrange the each recovery procedure dynamically by
previous recovery history.  As the result, the error recovery time
becomes faster.

      In case the error is found during read/write operation, DRP is
called and each procedure is adopted till the error is recovered.
Some procedures are to do the off track read/write operations, and
some are to retry the read/ write operations changing channel
parameters.  The error symptom is various by each Hard Disk Drive,
and the effective DRP is also various.  Dynamic Data Recovery
Procedure concept is to change the procedure sequence dynamically
according to the previous error recovery results.  Effective
procedure for that drive is set to the top line of the procedures.
As the result, effective and faster recovery becomes possible in case
of the error.

      This is achieved to have one more table in the micro code
(Figure).  Micro code is also needed to have the function to save the
table in the disk at power-off.

      The dynamic Data Recovery Procedure is applicable not only Hard
disk drive but also all read/write devices.