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Optimizing Static Attitudes to Improve Interface Reliability for Devices that Use Load/UnLoad Technology

IP.com Disclosure Number: IPCOM000122809D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Gillis, D: AUTHOR [+2]

Abstract

The slider static attitude can be optimized to improve the interface reliability of disk drives that use load/unload technology. This method also increases the real-estate resulting in a higher capacity drive.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Optimizing Static Attitudes to Improve Interface Reliability for
Devices that Use Load/UnLoad Technology

      The slider static attitude can be optimized to improve the
interface reliability of disk drives that use load/unload technology.
This method also increases the real-estate resulting in a higher
capacity drive.

First define Ri, Ro, and Rf:
  Ri =  The disk radius corresponding to the inner edge of the
         inner rail of the slider flying as close to the OD of
         the disk as possible.
  Rf =  The disk radius corresponding to the outer rail of the
         slider when L/UL ramp and the suspension begins to
         interact so that there is a finite load between the
         ramp and the suspension.

      Current designs allow the Roll-Static-Attitude (RSA) and
Pitch-Static Attitude (PSA) to vary by about +/- 1 degree centered
about the origin.  Hence, the area of disk damage will be distributed
between radii Rf and Ri.  It is undesirable to write data in these
regions since the probability of data loss is high.  Hence, the
potential loss of real estate is approximately {pi*(Rf*Rf - Ri*Ri)}.
As an example, if we assume Rf to be 45 mm and Ri to be 43.4 (width
of a 50%  slider is 1.6 mm) then the real estate loss will be about
450 mm*mm.

      Experimental results indicate that a slider with positive RSA
will damage the disk at radius Ri and a slider with negative RSA will
damage the disk at radius...