Patent ID: 11955139
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A hard disk drive (HDD) comprising:
a plurality of disk media rotatably mounted on a spindle hub;
a plurality of disk spacers each interposed between adjacent disk media of the plurality of disk media;
a spindle motor assembly comprising the spindle hub and a hub flange extending radially from the spindle hub and applying a clamping force to the disk media and the disk spacers to secure the disk media to the spindle hub, the hub flange comprising:
a disk-facing side and a base-facing side, and
multiple protrusions extending from a surface of the disk-facing side and in contact with a bottom disk medium of the plurality of disk media, thereby applying the clamping force at multiple respective contact locations on the bottom disk medium;
wherein:
each of the multiple protrusions comprises an annular protrusion circumscribing the hub, and
the multiple protrusions comprise an inner annular protrusion having a first center height and an outer annular protrusion having a second center height greater than the first center height;

a plurality of head sliders each housing a read-write transducer configured to read from and to write to a respective disk medium; and
an actuator configured for moving the head sliders to access portions of the disk media.