Patent ID: 6144525
Filing Date: 2000-11-07
Classification: G11B

Abstract:
A high-density data recording medium for use in a floppy diskette, said data recording medium comprising a flexible metallic substrate and a data-recording layer, wherein the metallic substrate comprises (1) a non-metallic core formed of a material that, with a change in temperature, expands a first amount in a first direction and a second amount in a second direction along the core, said first amount differing from said second amount, and (2) a metallic layer, wherein the metallic layer is selected from the group consisting of a non-ferrous metallic material and a non-magnetizable metallic material, wherein the data-recording layer is selected from the group consisting of a magnetic data recording layer and a magneto-optical data recording layer having a coercivity of at least about 1200 Oersted, wherein the metallic substrate is sufficiently thin that the substrate flexes when contacted by a data head of a floppy disk drive, and wherein the metallic layer has a sufficient thickness and strength to prevent said first amount of expansion from differing substantially from said second amount of expansion with said change in temperature.