Browse Prior Art Database

Space Saving Track Format for Magnetoresistive Heads

IP.com Disclosure Number: IPCOM000117885D
Original Publication Date: 1996-Jul-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Greenberg, R: AUTHOR [+2]

Abstract

Disclosed is a Hard Disk Drive (HDD) track format and Magneto-Resistive (MR) head read and write element offset definition which, when used in conjunction, achieve improved format efficiency and error rates.

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This is the abbreviated version, containing approximately 61% of the total text.

Space Saving Track Format for Magnetoresistive Heads

      Disclosed is a Hard Disk Drive (HDD) track format and
Magneto-Resistive (MR) head read and write element offset definition
which, when used in conjunction, achieve improved format efficiency
and error rates.

      Fig. 1 shows an example of the typical HDD track format
used by MR head files shipping today.  This format has the following
requirements and/or limitations.

      Read/write offset tolerances are designed to allow reading the
Identification Field (ID) on any track from the READ or WRITE track
center line.  This requires the ID to be positioned at a compromise
location between the two center lines (optimized for each track to
compensate for the rotary motion of the actuator).  The compromise ID
is always being read somewhat offtrack.  This forces the head to be
designed to minimize the offset between the Read and Write elements
to improve the ID's read error rate.  The proximity of the MR element
leads to the write pole causes causes a planarity problem in the
write element that adversely effects file error rates.

      The error rates associated with reading the compromise ID
presently limit the Tracks Per Inch (TPI) achievable by HDD's using
MR heads to about 4500 TPI.  Fig. 1 Typical track format with a
compromise ID.

      Fig. 2 shows an example of Track format that is the subject of
this disclosure.

      The new format contains separate read and write ID's.  This
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