Browse Prior Art Database

Reducing Hard Disk File Handling Damage by using a Protective User Frame

IP.com Disclosure Number: IPCOM000108311D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Boigenzahn, JF: AUTHOR [+4]

Abstract

This article describes a hard disk file user frame design which protects the HDA (head disk assembly) from externally applied shocks caused by dropping the disk file when it is not packaged or secured into a system chassis.

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

Reducing Hard Disk File Handling Damage by using a Protective User Frame

       This article describes a hard disk file user frame design
which protects the HDA (head disk assembly) from externally applied
shocks caused by dropping the disk file when it is not packaged or
secured into a system chassis.

      A user frame is created that prevents the HDA of a disk file
from impacting a surface that the disk file is dropped onto.  This is
obtained by ensuring that the 8 outboard corners of the user frame
extend beyond the physical envelope of the HDA.  Fig. 1 highlights a
single corner of a user frame in one direction.  The actual amount of
"clearance" required is dependent upon the stiffness of the
shockmount system and the amount "sway" which is expected during a
drop.

      The effectiveness of this invention is most easily described by
visualizing the effective transmission of shock generated during a
drop.

      A file dropped from a given height and impacting on an
unprotected portion of the HDA would receive a shock input similar to
that described in Fig. 2.

      A drop from the same height, impacting on the user frame, would
generate the same input to the file; however, the input to the HDA
would be altered by the transmissibility of the shockmount system.
The shock isolation effect would result in a lower peak acceleration
level spread over a longer period of time.  This resulting shock
pulse is less detrimental to the HDA.