Laser controller for heat-assisted magnetic recording device
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Isokawa
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Abstract
According to one embodiment, there is provided a magnetic disk device including a light source, a light irradiation element, and a controller. The light irradiation element is configured to receive light from the light source to irradiate light onto a magnetic disk. The controller is configured to switch between a first control and a second control according to a pulse width of data to be written onto the magnetic disk. The first control keeps an output of the light source at a first value. The second control makes the output of the light source change periodically between the first value and a second value lower than the first value.
Claims20
A magnetic disk device comprising:
- a light source;
- a light irradiation element configured to receive light from the light source to irradiate light onto a magnetic disk;
- and
- a controller configured to keep an output of the light source at a first value when a first time from an edge timing of pulse of data to be written onto the magnetic disk until a next edge timing is less than a first threshold, and to change the output of the light source from the first value to a second value lower than the first value when the first time is greater than or equal to the first threshold.
A controller which controls a light source in a magnetic disk device comprising a light irradiation element that receives light from the light source to irradiate light onto a magnetic disk, wherein
- the controller is configured to keep an output of the light source at a first value when a first time from an edge timing of pulse of data to be written onto the magnetic disk until a next edge timing is less than a first threshold, and to change the output of the light source from the first value to a second value lower than the first value when the first time is greater than or equal to the first threshold.
A control method which controls a light source in a magnetic disk device having the light source and a light irradiation element that receives light from the light source to irradiate light onto a magnetic disk, the control method comprising:
- keeping an output of the light source at a first value when a first time from an edge timing of pulse of data to be written onto the magnetic disk until a next edge timing is less than a first threshold;
- and
- changing the output of the light source from the first value to a second value lower than the first value when the first time is greater than or equal to the first threshold.
Dependencies are inferred from the claim text.