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Forced Random Access Application to Improve Flyability Performance

IP.com Disclosure Number: IPCOM000114445D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Endo, T: AUTHOR [+4]

Abstract

This article describes a Hard Disk Drive (HDD) system which executes a forced random access sequence. A magnetic head in HDD system flies on a disk at hight 0.05- 0.2 micro-meter. During the flying of a head, some sticking of debris or contaminations on a disk to a head can happen. These contanminations make the flying reliability of the head worse. This invention improves such a defect in a HDD system.

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This is the abbreviated version, containing approximately 100% of the total text.

Forced Random Access Application to Improve Flyability Performance

      This article describes a Hard Disk Drive (HDD) system which
executes a forced random access sequence.  A magnetic head in HDD
system flies on a disk at hight 0.05- 0.2 micro-meter.  During the
flying of a head, some sticking of debris or contaminations on a disk
to a head can happen.  These contanminations make the flying
reliability of the head worse.  This invention improves such a defect
in a HDD system.

      The Figure shows an example of the Forced Random Access
Sequence.  When no command from the system comes to the HDD within
some defined time, a random access operation is executed in the HDD.

      In this example, a Random acesss operation is executed, when
any other command operation is not executed in the previously defined
time.  By this forced operation, sticking contaminations can be
removed from the head, then the head reliability for the read/write
operation can be improved.