US 2026/0229253 A1 · MAGNETIC RECORDING MEDIA/DISKS AND METHODS AND APPARATUS FOR IDENTIFYING MAGNETIC RECORDING MEDIA/DISKS SUITABLE FOR DATA STORAGE DEVICES

Abstract

Magnetic recording disks and methods and apparatus of identifying a magnetic recording disk suitable for a data storage device configured for magnetic recording are described. In an aspect, a magnetic recording disk includes a glass substrate having a data surface, and a magnetic recording layer on the data surface for magnetic recording, where the magnetic recording disk has a thickness less than 0.5 millimeter. In this aspect, the magnetic recording disk has a flatness value corresponding to a height difference between a highest point and a lowest point on the data surface, and the flatness value is greater than a first flatness threshold and the data surface comprises one of a concave shape, a convex shape, and a cylinder shape.

Claims25

Dependent claims

A magnetic recording disk, comprising:

a glass substrate having a data surface;
and
a magnetic recording layer on the data surface for magnetic recording,
wherein the magnetic recording disk has a thickness less than 0.5 millimeter,
wherein the magnetic recording disk has a flatness value corresponding to a height difference between a highest point and a lowest point on the data surface, and
wherein the flatness value is greater than a first flatness threshold and the data surface comprises one of a concave shape, a convex shape, and a cylinder shape.

3 more elements

A method of identifying a magnetic recording disk suitable for a data storage device configured for magnetic recording, the method comprising:

estimating a shape of a data surface of the magnetic recording disk, wherein the shape of the data surface is estimated to be one of a concave shape, a convex shape, a cylinder shape, and a saddle shape, and wherein the magnetic recording disk comprises a glass substrate;
determining a flatness threshold for the magnetic recording disk based on the shape of the data surface;
calculating a flatness value of the magnetic recording disk based on a height difference between a highest point and a lowest point on the data surface of the magnetic recording disk;
comparing the flatness value and the flatness threshold;
and
determining to utilize the magnetic recording disk for the data storage device based on the comparison of the flatness value and the flatness threshold.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

19/042,284Filed 31 Jan 2025

Published

6 Aug 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G11B 5/73921
Inorganic substrates: glass or ceramic substrates
G11B 5/82
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum: disk carriers
G11B 5/84
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: processes or apparatus…
G11B 5/8404
Processes or apparatus specially adapted for manufacturing record carriers: manufacturing base layers

Magnetic recording media/disks and methods and apparatus for identifying magnetic recording media/disks suitable for data storage devices

Life of this patent

Magnetic recording media/disks and methods and apparatus for identifying magnetic recording media/disks suitable for data storage devices

Life of this patent

Abstract

Claims25