Browse Prior Art Database

Easy Implementation of Post Write Error Retry

IP.com Disclosure Number: IPCOM000117446D
Original Publication Date: 1996-Feb-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Ishibashi, K: AUTHOR [+3]

Abstract

Disclosed is a method of implementing Post Write Error Retry procedure without adding any complicated hardware or software resources. Just changing the method of pacing the host data transfer, the post write error retry can easily be achieved.

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Easy Implementation of Post Write Error Retry

      Disclosed is a method of implementing Post Write Error
Retry procedure without adding any complicated hardware or software
resources.  Just changing the method of pacing the host data
transfer, the post write error retry can easily be achieved.

      The Post Write Error Retry is a scheme to ensure that write
data operation is done without any error.  Among the error causes of
write operation, there are some those can not be detected during the
operation.  The external mechanical shock is the most suitable
example of this type of error cause for an Hard Disk Drive (HDD)
which is employing the embedded sector servo.

      With the embedded sector servo, the position of the writing
head is measured periodically from the servo patterns on the disk.
If an external mechanical shock causes a position of the head to
shift from the target, the position error can not be detected until
the next servo pattern is read (Fig. 1).

      Usually, small HDD use ring sector buffer and Host can fill new
data soon after the old data is written onto the disk.  With this
type of pacing scheme, even if an error is detected at the next
coming servo pattern, no retry operation can not be done because the
data on buffer is already written over by host.  To avoid this, there
should be some "offset" between the disk buffer pointer and host
buffer pointer.

      With this offset, the data to be written is secured at least
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