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Merge Defective Data Sector List into Primary Defect List at Maintenance

IP.com Disclosure Number: IPCOM000118944D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Fukuhisa, R: AUTHOR [+4]

Abstract

Disclosed is a method to support the merge option of a defective sector list into a primary defect list that was detected at Audio-Visual (AV) specific Read/Write operations. An AV application requires an isochronous data transfer of Read/Write operation even if the command completed with some errors. Hard Disk Drive (HDD) keeps this erroneous location and then refers it to merge into a primary defect list.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 79% of the total text.

Merge Defective Data Sector List into Primary Defect List at Maintenance

      Disclosed is a method to support the merge option of a
defective sector list into a primary defect list that was detected at
Audio-Visual (AV) specific Read/Write operations.  An AV application
requires an isochronous data transfer of Read/Write operation even if
the command completed with some errors.  Hard Disk Drive (HDD) keeps
this erroneous location and then refers it to merge into a primary
defect list.

      Normal Read/Write operation (not AV specific) will try
to reallocate the defective data sector when media errors are
detected.  Defective sector reallocation is important for data
integrity.  But for an AV application, the completion of the command
within the specified time is more important.  In this case, there is
no time to execute reassign block or related operation.  HDD firmware
can keep this erroneous location.  (Not reallocation, just keep the
location only at this time.)  After the end of application use, the
AV system issues some special command or maintenance command.  Then
the HDD tries  to merge the defective data location into a primary
defect list, instead  of reallocation.  At this time, reallocation
instead of merge is another  solution.  But reallocation means that
the data sector cannot be aligned  as "in-line" on the media.
Reallocation causes performance degradation  and is not applicable
for AV appreciation.

      This method is also...