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Preferred Orientation of Magnetic Media

IP.com Disclosure Number: IPCOM000089892D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Lindsey, RD: AUTHOR

Abstract

A preferred orientation of the recorded magnetization direction relative to the fixed media orientation is established in a magnetic recording system. Transient signals, developed during recording of information and correction operations in particular, are minimized.

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Preferred Orientation of Magnetic Media

A preferred orientation of the recorded magnetization direction relative to the fixed media orientation is established in a magnetic recording system. Transient signals, developed during recording of information and correction operations in particular, are minimized.

During its manufacture, media 1 at A is moved in the direction indicated by arrow 2, while the oxide coating is still wet, past permanent magnet 3 having flux patterns indicated by line 4 to orient the oxide with a predominantly longitudinal direction of orientation.

However, a vertical component of orientation is also imparted as indicated by arrows 5. By correctly choosing the orientation direction in relation to the magnetization direction during record, the undesirable effect of the vertical magnetization component can be minimized. For example, it is assumed that a typical recording operation, drawing B, involves erasing the media in the forward direction, erasing the media in the reverse direction and then recording the desired data again in the forward direction. This develops turnaround times and turnoff times as shown.

Without the preferred orientation of the media, extra bits are recorded on the media following the last corrected character. Turnaround bits are caused by a change in direction of media motion with erase current on. Turnoff bits are caused when changing from a Record to a Play mode. The effect of the extra bits is practically eliminated...