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Uncoated Lubricated Glass Substrates with Smooth Isolated Bumps for Piezo Electric Glide Sliders Calibration

IP.com Disclosure Number: IPCOM000118135D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Baumgart, P: AUTHOR [+4]

Abstract

Magnetic disk drives are information storage devices which utilize at least one rotatable magnetic media disk, a magnetic head on a slider for reading data from and writing data to the disk, a suspension for supporting the slider, and a positioning actuator coupled to the suspension for moving the slider across the disk to the desired position on the disk. When the disks are rotated in the disk drive, the magnetic head on the slider contacts the surface of the disk or rides on a cushion of air referred to as an air bearing, slightly above the surface of the disk in the order of 0.075 um. Asperities which are high enough to impact the magnetic head/slider during disk operation can cause failure of the drive.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 57% of the total text.

Uncoated Lubricated Glass Substrates with Smooth Isolated Bumps for
Piezo Electric Glide Sliders Calibration

      Magnetic disk drives are information storage devices which
utilize at least one rotatable magnetic media disk, a magnetic head
on a slider for reading data from and writing data to the disk, a
suspension for supporting the slider, and a positioning actuator
coupled to the suspension for moving the slider across the disk to
the desired position on the disk.  When the disks are rotated in the
disk drive, the magnetic head on the slider contacts the surface of
the disk or rides on a cushion of air referred to as an air bearing,
slightly above the surface of the disk in the order of 0.075 um.
Asperities which are high enough to impact the magnetic head/slider
during disk operation can cause failure of the drive.

      To achieve reliability of the slider-disk interface, in
particular at very close disk spacing, the disk must be free of
asperities which can lead to slider-disk contacts.  The means of
assuring the disk is free of asperities has been to use a glide-test
slider with  a Piezoelectric (PZT) sensor to detect disk asperities.
However, due to  component variations, the PZT signal from these
glide-test sliders needs  to be calibrated by measuring the contact
signals during impact with well  calibrated height and shape
asperities.  Currently, the well calibrated  asperities are NiP bumps
formed by using a Nd:YFL laser (*).  This type  of bu...