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Browse Prior Art Database

Disk Surface Wipe Method

IP.com Disclosure Number: IPCOM000100479D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 45K

Publishing Venue

IBM

Related People

Sado, M: AUTHOR

Abstract

Disclosed is a method that on diskette inserting, protects a disk surface from pressing foreign material like dust or metal due to a side "1" head loading on the disk surface. This method makes a disk rotate in order to wipe out the foreign material of the disk surface before the side "1" head loads on the disk surface.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 68% of the total text.

Disk Surface Wipe Method

       Disclosed is a method that on diskette inserting,
protects a disk surface from pressing foreign material like dust or
metal due to a side "1" head loading on the disk surface. This method
makes a disk rotate in order to wipe out the foreign material of the
disk surface before the side "1" head loads on the disk surface.

      This method consists of an electrical modification and a
mechanical modification.  The electrical modification functions to
make a spindle motor rotate before the side "1" head reaches the
surface of a disk.  To create a time of the motor rotating, "CSTIN"
(Cassette in place switch, called "S-1" as another name) triggers a
single-shot of 0.22 seconds (or longer than 0.22 seconds).  The
single-shot creates a signal of motor-on to make the motor rotate.
0.22 seconds is as a result of 0.02 seconds added to 0.2 seconds. 0.2
seconds is required for the motor to rotate 360 degrees in the worst
case of chucking and is derived from 60 seconds being divided by 300
rpm.  0.02 seconds is required for the motor to rotate as 20 degrees
which corresponds to a head opening window of a diskette, 0.22
seconds is equivalent to rotate the disk 380 degrees.

      The mechanical modification provides more precise control of
head loading than current mechanisms.  There are two ways.  One is
that as motion control, a mechanism like dumper/friction/gear
deceleration controls precisely going down movement of the side "1"
hea...