Browse Prior Art Database

Sensing Method of Actuator Hitting Against Crash Stops

IP.com Disclosure Number: IPCOM000119899D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Arai, K: AUTHOR [+2]

Abstract

Disclosed is a simple method for sensing when an actuator hits inner and outer crash stops in Hard Disk Drives (HDDs).

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

Sensing Method of Actuator Hitting Against Crash Stops

      Disclosed is a simple method for sensing when an actuator
hits inner and outer crash stops in Hard Disk Drives (HDDs).

      Usually the actuator does not touch the crash stop during
operation except at the shipping/power-off conditions or, in the
extreme case, when undesirable operating conditions occur.  The
objective of this method is to sense the extreme case when the
actuator hits crash stops.  This sensing signal can be used for
preventing an HDD catastrophe.

      The method disclosed is based on the following two
characteristics:
      (1) the usual actuator is electrically conductive, and
      (2) the usual crash stop is made of rubber and is
          non-conductive.

      According to this method, a thin wire is wound around a crash
stop to provide a sense signal (Fig. 1).  This wire is connected to a
comparator/logic for obtaining a TTL sense signal output, as shown in
Fig.  2, when the actuator hits the crash stop.