Browse Prior Art Database

Raised Area to Minimize and Localize Arm to Disk Contact

IP.com Disclosure Number: IPCOM000117805D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Allen, D: AUTHOR [+2]

Abstract

Disclosed is a method to create a raised feature on each head support structure so that contact between the head support structure and the disk can only occur at this feature.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Raised Area to Minimize and Localize Arm to Disk Contact

      Disclosed is a method to create a raised feature on each head
support structure so that contact between the head support structure
and the disk can only occur at this feature.

      The feature can be made to have a small contact area, and hence
the area of the damage site created on the disk can be minimized.
When a damage site is sufficiently small, the data previously written
at this site can be recovered by Error Correction Code (ECC).

      The raised feature allows the location of the damage to be
controlled as well.  The damage can be forced to occur in one of
three areas of the disk:
  1.  Where no data is written.
  2.  Where lost data can be easily recovered by error correction
code.
  3.  Where low priority non-customer data is stored.

      The raised feature must be located so that contact with the
disk does not damage any component of the head support structure.
Locations with sufficient stiffness include the actuator arm, the
mount plate, and the area of the load beam backed by the actuator
arm.  One possible shape for the raised feature is a spherical tip,
which will minimize the contact area.  This is illustrated in the
Figure which shows the raised area located on the mount block of the
head-gimbal-assembly.