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Track Misregistration Enhancement for Recorded Data Tracks Written Adjacent and in Opposite Directions

IP.com Disclosure Number: IPCOM000117735D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Adams, G: AUTHOR [+2]

Abstract

High density tape recording systems are utilizing track formats which place tracks very close together and sometimes the tape is moved forward for some tracks and backward for others (Interleaved recording). When analyzing the worst conditions where adjacent tracks may encroach on each other, it often occurs at the boundary of two adjacent and opposite direction tracks. This is because additional track position variables are brought to bear in this condition. Since all conditions must provide satisfactory data reliability, generally the dimensional compensation required for the worst case tracks is needlessly applied to all the others. The following describes how one might compensate more efficiently: 1. Determine the worst case Track Misregistration (TMR) among tracks written and read in the same direction.

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Track Misregistration Enhancement for Recorded Data Tracks Written
Adjacent and in Opposite Directions

High density tape recording systems are utilizing track formats which
place tracks very close together and sometimes the tape is moved
forward for some tracks and backward for others (Interleaved
recording). When  analyzing the worst conditions where adjacent
tracks may encroach on each  other, it often occurs at the boundary
of two adjacent and opposite direction tracks.  This is because
additional track position variables  are brought to bear in this
condition.  Since all conditions must provide  satisfactory data
reliability, generally the dimensional compensation required for the
worst case tracks is needlessly applied to all the others.  The
following describes how one might compensate more efficiently:
  1.  Determine the worst case Track Misregistration (TMR) among
tracks
       written and read in the same direction.  Forward tracks 1,2,3
and
       backward tracks 4,5,6.  Do not consider the boundary between
       tracks 3 and 4 since this is at a direction boundary.  Call
this
       Uni-directional TMR.
  2.  Determine the additional direction boundary variables acting at
       the boundary of opposite direction tracks.  In a "Fixed Head"
       system these are forward to backward tape shift, head module
to
       head module alignment, head azimuth, etc..  In a "Servo Track
       Following Head"...