Browse Prior Art Database

High Bandwidth Optical Channel for Rotating Head Magnetic Tape

IP.com Disclosure Number: IPCOM000110213D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

Onton, A: AUTHOR [+2]

Abstract

The invention disclosed is a tape drive storage apparatus employing an optical data link in place of conventional multiple rotary electromechanical transformers. This apparatus enables high bandwidth data transfer between read/write heads on a rotating head drum and the stationary tape drive.

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This is the abbreviated version, containing approximately 73% of the total text.

High Bandwidth Optical Channel for Rotating Head Magnetic Tape

      The invention disclosed is a tape drive storage apparatus
employing an optical data link in place of conventional multiple
rotary electromechanical transformers.  This apparatus enables high
bandwidth data transfer between read/write heads on a rotating head
drum and the stationary tape drive.

      Rotating head technology offers the advantage of low cost with
high areal density over competing digital recording apparatus.
However, for high-end systems, it becomes necessary to increase the
number of heads in order to perform read-after-write verification of
tape data and to overcome data rate limitations imposed by the
rotating heads' bandwidth.  A substantial cost and complication is
rotating head tape technology is the coupling of signals from the
rotating drum to the stationary drive.  Such coupling was achieved by
the prior art with rotary transformers.

      The proposed invention couples data to and from the rotating
head using close proximity coupling between fibers, or alternatively,
only generally directed optical signals along the axis of rotation of
the drum.  The optical signals are sent and received by an integrated
circuit detector/driver chip mounted in the head drum.  Power to
operate the circuit is obtained with a single rotary transformer of
no particular bandwidth requirement.  The AC power is processed by a
power supply circuit and storage/decoupling capacitors which...