US 12,073,856 B1
Data storage device with laser pre-bias optimization using disk thermal-magnetic response mapping in heat-assisted magnetic recording
Phillip S. Haralson, Huntington Beach, CA (US); Farzad Novin, Laguna Niguel, CA (US); and Pierre-Olivier Jubert, San Jose, 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. 18/232,009.
Claims priority of provisional application 63/455,879, filed on Mar. 30, 2023.
Int. Cl. G11B 27/36 (2006.01); G11B 5/012 (2006.01); G11B 5/03 (2006.01); G11B 11/105 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/03 (2013.01) [G11B 5/012 (2013.01); G11B 2005/0021 (2013.01)] 14 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, wherein the selected head comprises a thermally energizing component; and
one or more processing devices configured to:
generate a determination of magnetic responsiveness to thermal energy of at least one position of the corresponding disk surface in response to an operation of the selected head; and
determine and apply a pre-bias current to the thermally energizing component of each selected head prior to activating the thermally energizing component at a nominal current for a write operation, with the selected head proximate to the at least one position of the corresponding disk surface, wherein the pre-bias current is based on the determination of magnetic responsiveness to thermal energy of the at least one position of the corresponding disk surface, wherein the applied pre-bias current provides an initial write strength starting from a beginning of the write operation, while still remaining low enough to avoid erasing or eroding data on the one or more disks.