Data storage device with mapping and mitigation of laser mode hop effects in heat-assisted magnetic recording (HAMR)

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 generating the map comprises:
• identifying a laser mode hop effect at an identified position on the disk surface, at a first set of operating parameters of the selected head;
• and
• identifying a second set of operating parameters of the selected head at the identified position which counteract the identified laser mode hop effect at the identified position.

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, and
• wherein the one or more processing devices are further configured to:
• determine a predicted long-term fly height (LTFH) change of the selected head;
• and
• apply a correction to at least one of the map of laser mode hop effects, and the laser mode hop mitigation, based on the predicted LTFH change of the selected head.

One or more processing devices comprising:

• means for generating a map of laser mode hop effects for a selected head operating across a corresponding disk surface of a data storage device, and across a range of operating conditions of the selected head;
• means for determining a set of mitigation parameter modifications relative to positions of the disk surface, based on the map of laser mode hop effects;
• and
• means for applying a laser mode hop mitigation in operating the selected head at a selected position, among the positions of the disk surface, based on the set of mitigation parameter modifications relative to positions of the disk surface.