Browse Prior Art Database

Self Cleaning Rigid Disk Head Design

IP.com Disclosure Number: IPCOM000110495D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Keller, CG: AUTHOR [+2]

Abstract

The standard air-bearing slider design is vulnerable to impacting particulate debris that is larger than the flying height (0.2 micrometer), but small enough to fit under the leading edge taper (5 micrometers). Due to the skew of the slider in disk drive products, the leading edge taper is frequently the first part of the slider to go over new disk real estate when accessing to a new track. Any particles of the critical size range in the path of the taper will get wedged under the slider. Depending on the properties of the particle, it may scratch the disk and/or slider, or it may itself be plastically deformed and adhere to the disk. These phenomena must be avoided to achieve high reliability of the device.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Self Cleaning Rigid Disk Head Design

       The standard air-bearing slider design is vulnerable to
impacting particulate debris that is larger than the flying height
(0.2 micrometer), but small enough to fit under the leading edge
taper (5 micrometers).  Due to the skew of the slider in disk drive
products, the leading edge taper is frequently the first part of the
slider to go over new disk real estate when accessing to a new track.
Any particles of the critical size range in the path of the taper
will get wedged under the slider.  Depending on the properties of the
particle, it may scratch the disk and/or slider, or it may itself be
plastically deformed and adhere to the disk.  These phenomena must be
avoided to achieve high reliability of the device.  Particles are
swept aside if the edge of an air-bearing rail passes over a new
track before the taper reaches that track radius during seeks.
Particles that are higher than the flying height cannot fit under the
side of the rail, and cannot be wedged in because of the large bevel
angle.

      Fig. 1 shows a slider design for a file in which the ID rail
1 is always skewed to sweep incoming tracks with its ID edge 2 during
OD to ID seeks.  The OD rail has a skew machined into its leading OD
corner 3.  This provides a sweeping edge 4 at air bearing height that
sweeps the disk during ID to OD seeks.  This principle can be applied
to one or both rails, and be be adapted to accommodate the skews
designed into an...