US 12,154,606 B2
Data storage device with mapping and mitigation of laser mode hop effects in heat-assisted magnetic recording (HAMR)
Bernhard E. Knigge, San Jose, CA (US); Phillip S. Haralson, Huntington Beach, CA (US); Naoto Ito, Fujisawa (JP); and Derrick Burton, Ladera Ranch, CA (US)
Assigned to WESTERN DIGITAL TECHNOLOGIES, INC., San Jose, CA (US)
Filed by WESTERN DIGITAL TECHNOLOGIES, INC., San Jose, CA (US)
Filed on Aug. 9, 2023, as Appl. No. 18/232,041.
Claims priority of provisional application 63/428,913, filed on Nov. 30, 2022.
Prior Publication US 2024/0177735 A1, May 30, 2024
Int. Cl. G11B 11/105 (2006.01); G11B 5/48 (2006.01); G11B 5/60 (2006.01); G11B 7/1263 (2012.01); G11B 13/04 (2006.01); G11B 5/00 (2006.01)
CPC G11B 7/1263 (2013.01) [G11B 5/4866 (2013.01); G11B 5/607 (2013.01); G11B 13/045 (2013.01); G11B 2005/0018 (2013.01); G11B 2005/0021 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A data storage device, comprising:
one or more disks;
an actuator mechanism configured to position a selected head among one or more heads proximate to a corresponding disk surface among the one or more disks; and
one or more processing devices, configured to:
generate a map of laser mode hop effects across the corresponding disk surface, for the selected head; and
apply a laser mode hop mitigation in operating the selected head, based on the map of laser mode hop effects,
wherein the one or more processing devices are further configured to generate the map of laser mode hop effects across the corresponding disk surface across a range of operating conditions of the selected head.