Browse Prior Art Database

Axially Decentered Erase Head

IP.com Disclosure Number: IPCOM000086631D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Cheatham, SD: AUTHOR [+2]

Abstract

This is an erase head wherein the erase fringe is minimized during an erase pass.

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Axially Decentered Erase Head

This is an erase head wherein the erase fringe is minimized during an erase pass.

Fig. 1 shows a track format for a helical-scan recording device which proceeds with block write and/or read operations either in a step or a slew mode of operation. The erase, write, and read heads are normally aligned with gap centers axially coincident with the center line 10. With this configuration, a fringe field from the erase gap will result in partial erasure of the previously written data in track 12.

The inaccuracies of the step or slew operation result in an uncertainty in the centerline-to-centerline spacing of adjacent data tracks. Thus, inaccuracy may result in the erasure of a previously written track by the erase head as aligned in Fig. 1.

The alignment shown in Fig. 2 minimizes the effect of this position inaccuracy. Fig. 2 shows a change in format whereby the erase gap is axially decentered from the center line 10 to the center line 14. In this way, any fringe field from the erase gap will not disturb previously written data tracks.

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