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Desiccant Design and Desiccant Placement for Head-Disk Assembly Humidity Control

IP.com Disclosure Number: IPCOM000105222D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Bleich, HE: AUTHOR [+4]

Abstract

The invention is a system for maintaining an optimal relative humidity (RH) range within a thin-film disk file, comprising the use of a desiccant with optimal bypass at the breather hole and an optional internal humidity buffer.

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Desiccant Design and Desiccant Placement for Head-Disk Assembly Humidity Control

      The invention is a system for maintaining an optimal relative
humidity (RH) range within a thin-film disk file, comprising the use
of a desiccant with optimal bypass at the breather hole and an
optional internal humidity buffer.

      The relative humidity within a thin-film disk file has been
shown to affect the operability of the file.  For example, the
start-stop performance of a lubricated thin-film disk with a carbon
overcoat begins to degrade below a RH of 10%.  Furthermore, the
problem of stiction and head and disk corrosion increase at RH's
greater than 30%.

      Experimentation has shown that the proposed invention maintains
a %10% - 30% RH range within the disk files for external RH ranging
from 20% - 80%.  This optimal RN is achieved by placing a finite
amount of desiccant at the breathing hole of the disk file, and by
limiting the degree of drying by permitting a portion of the incoming
air to bypass the desiccant.  For disk file having an air capacity of
one liter, at least 10 grams of desiccant and 25% bypass are
recommended

      The degree of drying provided by the desiccant may be limited
in several ways.  Two examples include:

1.  Sectoring the desiccant container so that certain sectors may be
    filled with a desiccant (e.g., silica gel), so that certain and
    the remaining sectors are filled with an inert material (e.g.,
    carbo...