Disk hub for retaining magnetic recording media for film thickness measurement
AssigneeWestern Digital Technologies, Inc.
InventorsLingyun Li, Ao Fan, Cheng Zhang
Life of this patent
Estimating the term…
Abstract
A disk hub is configured to retain a magnetic recording medium including an annulus shape and a layer configured for magnetic recording. The disk hub includes a base plate portion for supporting an inner diameter area of the magnetic recording medium and a stem portion on the base plate portion. The stem portion includes a frustoconical portion on the base plate portion and a top portion on the frustoconical portion. At least the top portion of the stem portion includes a material with a hardness less than that of stainless steel. The disk hub can reduce surface damages (e.g., scratches) on the media surface during media testing.
Claims25
A disk hub for retaining a magnetic recording medium comprising an annulus shape and a layer configured for magnetic recording, the disk hub comprising:
- a base plate portion for supporting an inner diameter area of the magnetic recording medium;
- and
- a stem portion on the base plate portion, the base plate portion and the stem portion formed as a unitary body, the stem portion comprising:
- a frustoconical portion on the base plate portion;
- and
- a top portion on the frustoconical portion,
- wherein at least the top portion of the stem portion comprises a material with a hardness less than that of stainless steel.
An apparatus for characterizing a magnetic recording medium for a data storage device, comprising:
- a disk hub configured to retain and enable the magnetic recording medium to be rotated to one or more positions, wherein the disk hub comprises:
- a base plate portion for supporting an inner diameter area of the magnetic recording medium;
- and
- a stem portion on the base plate portion, the base plate portion and the stem portion formed as a unitary body, the stem portion comprising:
- a frustoconical portion on the base plate portion;
- and
- a top portion on the frustoconical portion, wherein at least the top portion of the stem portion comprises a material with a hardness less than that of stainless steel;
- and
- a measurement assembly configured to measure a thickness of at least one film on a data recording surface of the magnetic recording medium at the one or more positions.
A method of manufacturing a disk hub for retaining a magnetic recording medium comprising an annulus shape and a layer configured for magnetic recording, the method comprising:
- forming the disk hub using a thermoplastic polymer, comprising,
- providing a base plate portion for supporting an inner diameter of the magnetic recording medium;
- and
- providing a stem portion on the base plate portion, the base plate portion and the stem portion formed as a unitary body, wherein the stem portion comprises:
- a frustoconical portion on the base plate portion;
- and
- a top portion on the frustoconical portion.
Dependencies are inferred from the claim text.