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1. WO2021061237 - MAGNETIC RECORDING APPARATUS COMPRISING DISK WITH REDUCED THICKNESS AND REDUCED DISK FLATNESS

Publication Number WO/2021/061237
Publication Date 01.04.2021
International Application No. PCT/US2020/038763
International Filing Date 19.06.2020
IPC
G11B 5/73 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
73Base layers
CPC
G11B 5/73919
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
73Base layers ; , i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
739Magnetic recording media substrates
73911Inorganic substrates
73917Metallic substrates, i.e. elemental metal or metal alloy substrates
73919Aluminium or titanium elemental or alloy substrates
G11B 5/73921
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62Record carriers characterised by the selection of the material
73Base layers ; , i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
739Magnetic recording media substrates
73911Inorganic substrates
73921Glass or ceramic substrates
Applicants
  • WESTERN DIGITAL TECHNOLOGIES, INC. [US]/[US]
Inventors
  • SUZUKI, Shoji
  • BIANCHINI, John, Michael
Agents
  • FITCH, Gabriel
Priority Data
16/583,16925.09.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MAGNETIC RECORDING APPARATUS COMPRISING DISK WITH REDUCED THICKNESS AND REDUCED DISK FLATNESS
(FR) APPAREIL D'ENREGISTREMENT MAGNÉTIQUE COMPRENANT UN DISQUE À ÉPAISSEUR RÉDUITE ET PLANÉITÉ DE DISQUE RÉDUITE
Abstract
(EN)
A disk for a magnetic recording apparatus. The disk includes a substrate comprising a first surface and a second surface, wherein the substrate has a substrate thickness. The disk includes a first coating layer disposed over the first surface of the substrate, wherein the first coating layer has a first coating layer thickness. The disk includes a second coating layer disposed over the second surface of the substrate, wherein the second coating layer has a second coating layer thickness. The disk has a disk thickness, wherein the disk thickness includes the substrate thickness. The maximum thickness difference between the first coating layer thickness and the second coating layer thickness is a function of the square of the disk thickness.
(FR)
L'invention concerne un disque pour un appareil d'enregistrement magnétique. Le disque comprend un substrat comprenant une première surface et une seconde surface, le substrat ayant une épaisseur de substrat. Le disque comprend une première couche de revêtement disposée sur la première surface du substrat, la première couche de revêtement ayant une première épaisseur de couche de revêtement. Le disque comprend une seconde couche de revêtement disposée sur la seconde surface du substrat, la seconde couche de revêtement ayant une seconde épaisseur de couche de revêtement. Le disque a une épaisseur de disque, l'épaisseur de disque comprenant l'épaisseur du substrat. La différence d'épaisseur maximale entre la première épaisseur de couche de revêtement et la seconde épaisseur de couche de revêtement est une fonction du carré de l'épaisseur de disque.
Also published as
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