Thermal-assisted magnetic recording device capable of writing magnetic patterns on lower multi-step driving signals
AssigneeKabushiki Kaisha Toshiba
InventorNaoki Tagami
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Abstract
According to one embodiment, there is provided a magnetic disk device including a light irradiation element and a control unit. The light irradiation element is configured to irradiate a magnetic disk with light according to a driving signal. The control unit is configured to lower, in multistep manner, active level of the driving signal contributing intensity of the light when a low frequency pattern of write data is recorded into the magnetic disk.
Claims20
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A magnetic disk device comprising:
- a light irradiation element configured to irradiate a magnetic disk with light according to a driving signal;
- and
- a control unit configured to adjust a parameter to lower active level of the driving signal contributing intensity of the light according to a read signal quality when write data is recorded into the magnetic disk and is read, and configured to lower, in multistep manner, the active level of the driving signal according to the adjusted parameter when a low frequency pattern of the write data is recorded into the magnetic disk.
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A preamplifier which controls a driving signal in a magnetic disk device including a light irradiation element to irradiate the magnetic disk with light according to a driving signal,
- the preamplifier comprising:
- a control unit configured to adjust a parameter to lower active level of the driving signal contributing intensity of the light according to a read signal quality when write data is recorded into the magnetic disk and is read, and configured to lower, in multistep manner, the active level of the driving signal according to the adjusted parameter when a low frequency pattern of the write data is recorded into the magnetic disk;
- and
- a driving unit configured to supply the driving signal controlled by the control unit to the light irradiation element.
A control method of controlling a magnetic disk device, the method comprising:
- adjusting a parameter to lower active level of a driving signal of a light irradiation element according to a read signal quality when write data is recorded into a magnetic disk and is read, the light irradiation element being configured to irradiate a magnetic disk with light, the active level contributing intensity of the light;
- and
- lowering, in multistep manner, the active level of the driving signal according to the adjusted parameter when a low frequency pattern of the write data is recorded into the magnetic disk.
Dependencies are inferred from the claim text.