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Vacuum Assist Method for Improvement of Data Reliability And Head to Tape Interface Performance for Tape Read/Write Heads

IP.com Disclosure Number: IPCOM000099625D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 91K

Publishing Venue

IBM

Related People

Fisher, DE: AUTHOR [+3]

Abstract

Tape data storage system data reliability may fail to meet requirements with imperfect media before the specified number of tape passes due to failure of the Head-to-Tape Interface (HTI). Typical magnetic media develops regions of low tension when exposed to variations of temperature, humidity and rewinding tension. This feature has demonstrated significant improvement of data reliability by recovering the HTI performance, thereby extending the useful life of the tape head. Also, as the HTI degrades, the tension gradient across the media becomes more critical and, where the tape tension is below the nominal transport tension, begins to exhibit write and/or read errors. This invention compensates for these low tension areas on the tape by improving the contour wrap and the HTI compliance.

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This is the abbreviated version, containing approximately 52% of the total text.

Vacuum Assist Method for Improvement of Data Reliability And Head to Tape Interface Performance for Tape Read/Write Heads

       Tape data storage system data reliability may fail to
meet requirements with imperfect media before the specified number of
tape passes due to failure of the Head-to-Tape Interface (HTI).
Typical magnetic media develops regions of low tension when exposed
to variations of temperature, humidity and rewinding tension.  This
feature has demonstrated significant improvement of data reliability
by recovering the HTI performance, thereby extending the useful life
of the tape head.  Also, as the HTI degrades, the tension gradient
across the media becomes more critical and, where the tape tension is
below the nominal transport tension, begins to exhibit write and/or
read errors.  This invention compensates for these low tension areas
on the tape by improving the contour wrap and the HTI compliance.

      The head as designed, operates as an in-contact transducer,
i.e., the media must pass as close as possible over the read or write
gap to assure a useable signal transfer.

      The form of this feature is to include small ports in the head.
 These ports 6 (see Fig. 1) are placed on both sides of the read
and/or write gaps.  As the tape is being drawn across the head, a
small vacuum is applied to the appropriate ports.  This reduces the
air pressure at the leading edge of the HTI.  This allows a tighter
wrap of the tape over the head contour and a thinning of the air
bearing.  This results in a closer proximity and, in turn, data
reliability improvement, signal-to-noise (SNR) improvement and si...