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Browse Prior Art Database

Read-Compatible N- and 2N-Track Tape Recording Formats

IP.com Disclosure Number: IPCOM000112908D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Adams, G: AUTHOR [+2]

Abstract

Two tape recording formats are defined, which are functionally "Read-Compatible" with one another. One tape format includes N concurrent tracks on tape, while the other tape format includes 2N tracks on tape.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Read-Compatible N- and 2N-Track Tape Recording Formats

      Two tape recording formats are defined, which are functionally
"Read-Compatible" with one another.  One tape format includes N
concurrent tracks on tape, while the other tape format includes 2N
tracks on tape.

      It is required to create 2 different tape recording formats,
which involve the concurrent writing/reading of N and 2N tracks,
respectively;  it is also required that the magnetic recording head
which normally writes/reads 2N tracks concurrently be able to read
the N-Track tape format.

      An N-Track format (i.e., in which a group of N physical tracks
on tape are written or read concurrently) is defined, using Pitch 2P
as the physical spacing between each of the concurrent tracks on
tape.  A "Read-Compatible" 2N-Track format (i.e., in which a group of
2N physical tracks on tape are written or read concurrently) is also
defined, using Pitch P between each of the concurrent tracks on tape.
The N-Track format is processed using a magnetic write/read head with
a set of N channels operating concurrently, where each of the N read
or write elements are spaced 2P apart.  A different write/read head
with 2N channels operating concurrently is used to process the
2N-Track format; each of the read/write elements on this head are
spaced P apart.  By operating only 1/2 of the 2N read channels on the
latter head, selecting only the even-or odd-numbered read elements
(either group will include N re...