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Browse Prior Art Database

MO Direct Overwrite With Backward Compatibility

IP.com Disclosure Number: IPCOM000120184D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 32K

Publishing Venue

IBM

Related People

Makansi, T: AUTHOR [+2]

Abstract

A magnetic head and circuit design is disclosed that achieves both direct overwrite and backward compatibility in magneto-optic disk storage systems. A tapped magnetic head can be operated at two data rates. The slower data rate generates greater magnetic field strength, providing a writing means for the older generation of magneto-optical disks. The faster data rate produces less field strength, and is intended to write the newer disks. The design accommodates both older and newer disks as the data rate increases over time and the field strength requirement decreases.

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MO Direct Overwrite With Backward Compatibility

      A magnetic head and circuit design is disclosed that achieves
both direct overwrite and backward compatibility in magneto-optic
disk storage systems.  A tapped magnetic head can be operated at two
data rates.  The slower data rate generates greater magnetic field
strength, providing a writing means for the older generation of
magneto-optical disks.  The faster data rate produces less field
strength, and is intended to write the newer disks.  The design
accommodates both older and newer disks as the data rate increases
over time and the field strength requirement decreases.

      An augmentation of the standard H-driver switching circuit
provides a means of reversing the winding current in either mode of
operation.  Transistors Q3, Q4, Q5 and Q6 are used to reverse the
current in the fast writing mode. Transistors Q1, Q2, Q5 and Q6 are
used similarly in the slow writing mode.

      Disclosed anonymously.