Browse Prior Art Database

Beam Addressable High Density Magnetic Record File

IP.com Disclosure Number: IPCOM000080482D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

May, GH: AUTHOR

Abstract

This magnetic disk file structure obviates the difficulty in obtaining intimate contact between two flexible magnetic recording disks necessary for the magnetic transfer process.

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 73% of the total text.

Page 1 of 2

Beam Addressable High Density Magnetic Record File

This magnetic disk file structure obviates the difficulty in obtaining intimate contact between two flexible magnetic recording disks necessary for the magnetic transfer process.

A rotatable spindle 12 of conventional construction turns a magnetic record disk having three layers 14, 16, 18. The layer 14 is a transparent substrate of flexible or rigid construction. The layer 14 is coated with a layer 16 of magnetic record material, such as the ferrous oxide mixture conventionally used for the purpose. Another layer 18 of magnetic record material of similar constituency is coated over the layer 16. The layer 18 is made as thin as possible for obtaining the maximum density of recording.

High-coercive magnetic material is used for the layer 16, while the layer 18 is made of material having a coercivity sufficiently lower for permitting magnetic recording and/or reproducing, without erasing data recorded in the other layer 16. Curie temperatures of the materials likewise are chosen for optimum discrimination in recording/reproducing and erasing.

The layer 16 is the master record and the layer 18 is the transfer record. The data to be stored is recorded on the transfer record layer 18 in a conventional pattern track, as by a conventional magnetic transducer 22. A narrow slice of the conventional record track in the transfer layer 18 is recorded in the master layer 16 by a conventional thermomagnetic transfer process, u...