Adjusting laser power to achieve equivalent track spacing for paired heads that simultaneously write to a heat-assisted recording medium
AssigneeSeagate Technology LLC
InventorsWenzhong Zhu, Kenneth Haapala, Jon Trantham, Edward Charles Gage
Life of this patent
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Abstract
A relatively larger nominal track spacing associated with a first write head is determined and a relatively smaller nominal track spacing associated with a second write head is determined. The first and second write heads simultaneously write to respective different first and second surfaces of a heat-assisted recording medium. A laser write power for a selected one of the first write head and the second write head is changed to enable the first write head and the second write head to operate at an equivalent nominal track spacing.
Claims20
A method, comprising:
- determining a relatively larger nominal track spacing associated with a first write head and a relatively smaller nominal track spacing associated with a second write head, the first and second write heads simultaneously writing to respective different first and second surfaces of a heat-assisted recording medium;
- and
- changing a laser write power for a selected one of the first write head and the second write head to enable the first write head and the second write head to operate at an equivalent nominal track spacing.
An apparatus comprising:
- a write channel configured to communicate with first and second write heads that simultaneously write to respective different first and second surfaces of a heat-assisted recording medium;
- a laser controller configured to apply respective first laser power and second laser power to the first and second write heads during recording;
- and
- a system controller coupled to the write channel and the laser controller and configured to:
- determine a relatively larger nominal track spacing associated with the first write head and a relatively smaller nominal track spacing associated with the second write head;
- and
- decrease the first laser power to enable the first write head to operate at the relatively smaller nominal track spacing.
An apparatus comprising:
- a write channel configured to communicate with first and second write heads that simultaneously write to respective different first and second surfaces of a heat-assisted recording medium;
- a laser controller configured to apply respective first laser power and second laser power to the first and second write heads during recording;
- and
- a system controller coupled to the write channel and the laser controller and configured to:
- determine a relatively larger nominal track spacing associated with the first write head and a relatively smaller nominal track spacing associated with the second write head;
- and
- increase the second laser power to enable the second write head to operate at the relatively larger nominal track spacing.
Dependencies are inferred from the claim text.