READ-ONLY MAGNETIC RECORDING MEDIA AND PROCESS OF MAKING THE SAME

摘要

A method of making read-only magnetic recording media by the use of photolithographic/photoresist techniques, and the vacuum deposition of discrete bits of a high coercivity metal, followed by magnetization of said metal. A nonmagnetic substrate (11) is covered by a layer a photoresist (20) and a layer of high coercivity magnetic material (30). Selective light-pattern exposure of the resist, followed by layer removal procedures, cause the substrate to be covered by islands of hard magnetic material (10), in the pattern of a desired data track. The substrate is then subjected to the influence of a steady-state magnetic field in order to convert the metal islands into a read-only data pattern which can be read by a magnetic head. A floppy disk of this type is used to stress-test the head placement of floppy disk drives.