US 12,223,982 B1
Head velocity derating for data storage devices including disk media
Hiroshi Uchida, Yokohama (JP); Hidehiko Numasato, Hiratsuka (JP); Akira Yokozuka, Yokohama (JP); Shrey Khanna, San Jose, CA (US); and Peyman Niazi, Pleasanton, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Dec. 24, 2023, as Appl. No. 18/395,602.
Int. Cl. G11B 19/28 (2006.01); G11B 5/55 (2006.01); G11B 21/12 (2006.01)
CPC G11B 19/28 (2013.01) [G11B 5/55 (2013.01); G11B 21/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Data Storage Device (DSD), comprising:
a disk configured to store data;
a spindle motor configured to rotate the disk;
at least one head configured to read and write data on the disk;
a Voice Coil Motor (VCM) configured to move the at least one head over the disk; and
circuitry configured to:
receive a command to read or write data at a target location in an Outer Diameter (OD) region of the disk;
reduce an upper velocity limit for moving the at least one head to the target location, wherein the upper velocity limit is reduced in response to:
a direction needed to move the at least one head to the target location being in an Inner Diameter (ID) to OD direction across the disk; and
a starting position for moving the at least one head being at least as radially far from an OD region position as a predetermined threshold; and
move the at least one head to the target location using the reduced upper velocity limit to perform the command.