Browse Prior Art Database

Write-Sensitivity Shift Reduction

IP.com Disclosure Number: IPCOM000105229D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

Fouere, JC: AUTHOR [+3]

Abstract

A method for reducing magneto-optical disk write-sensitivity shift is disclosed. Write-sensitivity shift is the change in written mark length resulting from a given write cycle after a large number of write and/or erase cycles. The change in written mark length reduces the reliability of the system and consequently impacts the maximum achievable recording density. The problem thus presented is how to reduce the write sensitivity shift.

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Write-Sensitivity Shift Reduction

      A method for reducing magneto-optical disk write-sensitivity
shift is disclosed.  Write-sensitivity shift is the change in written
mark length resulting from a given write cycle after a large number
of write and/or erase cycles.  The change in written mark length
reduces the reliability of the system and consequently impacts the
maximum achievable recording density.  The problem thus presented is
how to reduce the write sensitivity shift.

      The aforementioned problem is solved by annealing the optical
disk (prior to final assembly).  Annealing accelerates write
sensitivity shift such that little further shifting occurs during
subsequent cycling.  Thus, the mark length resulting from a given
write cycle remains constant over time and usage for all practical
applications.  The temperature at which the disk is annealed is
determined experimentally so as to effectively reduce any subsequent
write sensitivity shift, without affecting other functional
characteristics of the disk such as signal amplitude, erase noise or
write noise.

Disclosed Anonymously.