Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Bidirectional Read After Write Tunnel Erase Head

IP.com Disclosure Number: IPCOM000081273D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Barrett, MC: AUTHOR [+3]

Abstract

A pair of erase gaps 1 and 2 interposed between identical read/write gaps 3 and 4 in magnetic head 10 provide tunnel erasing, during the time between writing and check-reading information on magnetic media.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Bidirectional Read After Write Tunnel Erase Head

A pair of erase gaps 1 and 2 interposed between identical read/write gaps 3 and 4 in magnetic head 10 provide tunnel erasing, during the time between writing and check-reading information on magnetic media.

Figs. 1 and 2 show bottom and side views, respectively, of head 10. While recording, the leading read/write gap is driven with the desired data signal. As the recording medium passes under the gaps 1 and 2, the edges of the newly written track are erased providing a reduction in track width and a relatively noise free buffer zone between adjacent tracks. As the recording media passes under the trailing read/write gap, the data is read from the track to provide an immediate error check. It is, therefore, unnecessary to make an additional pass over the tape to read-check.

Either one of the two read/write gaps 3 or 4 is used when the head 10 is operating in the read mode. Because head gaps 3 and 4 are symmetrical about the gaps 1 and 2, head 10 functions equally well in either direction of media motion. Head skew adjustments are accomplished by writing with the leading read/write gap, and adjusting the skew to maximize the signal from the trailing read/write gap with gaps 1 and 2 disabled.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]