Browse Prior Art Database

Method for Reducing a Formatting Time of a Magneto-Optical Disk

IP.com Disclosure Number: IPCOM000104557D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Demura, M: AUTHOR [+4]

Abstract

Disclosed is a method for a reducing formatting time of a magneto-optical disk by changing a disk rotation speed in the disk formatting time and controlling the erasing laser power according to the disk rotating speed. The disclosed method is widely applicable to any erasable optical disk drive.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Method for Reducing a Formatting Time of a Magneto-Optical Disk

      Disclosed is a method for a reducing formatting time of a
magneto-optical disk by changing a disk rotation speed in the disk
formatting time and controlling the erasing laser power according to
the disk rotating speed.  The disclosed method is widely applicable
to  any erasable optical disk drive.

      The disclosed method will be best understood with reference to
the drawing which schematically shows a spindle motor and laser power
control system.  Generally a spindle motor 3 rotates as constant
angular velocity corresponding to the spindle rotation index sensor 4
in all the case of read, write and erase process.  The laser power
out of a pick-up 5 is controlled by a laser power controller 1 to
certain power according to the processes.  In media formatting
process, there are three detail processes.  These are erase process,
format writing process and verify process.  In erase process of these
three process, the disclosed method is applicable.  First of all, the
pick-up 5 is set on the head of the data area in the disk and the
disk rotation speed is kept at general read/write speed.  At the same
time, the laser power is changed to general laser power.  Next, the
spindle rotation speed is changed to high speed mode.  At the same
time, index signal from the spindle rotation index sensor 4 is
inputted to a frequency counter 7.  A micro processor 6 sends a
command to laser power controll...