HAMR channel to preamp interface
AssigneeSeagate Technology LLC
InventorsHousan Dakroub, Christine Green, Edward C. Gage, Tim Rausch
Life of this patent
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Abstract
A circuit may be configured to reduce the power consumption and extend the life of a near field transducer of a heat-assisted magnetic recording (HAMR) device by pulsing a laser. The current that drives the laser may be of a frequency and magnitude so as to approximate the value of a continuous current in a continuous, non-pulsed laser. A system on chip (SOC), which may include a HAMR channel, can generate a laser data signal that may be synchronous with, and offset from, a write signal by a certain period of time, and may calculate certain parameters such as peak current and pulse width that may be applied to the signals in a preamp. The preamp signals can be used to program data to a disc medium.
Claims20
An apparatus comprising:
- a circuit including:
- a sub-circuit configured to manipulate a laser data signal;
- and
- an output configured to provide the laser data signal to a preamp to generate laser current, the circuit configured to:
- modulate the laser data signal so that it is offset from a write data signal;
- and
- modulate the laser data signal such that a pulse width of the laser data signal is the same as a minimum pulse width of the write data signal.
An apparatus comprising:
- a data storage device (DSD) including:
- a laser configured to heat a data storage medium;
- a preamp configured to:
- manipulate a peak amplitude and a minimum amplitude of laser current such that a combination of the peak amplitude and the minimum amplitude yield an equivalent modulated laser current;
- and
- provide the laser current to the laser;
- and
- a circuit configured to:
- manipulate a laser data signal;
- provide the laser data signal to the preamp to generate the laser current;
- and
- determine the equivalent modulated laser current, the equivalent modulated laser current corresponding to the laser current.
A method comprising:
- determining a laser current to heat a disc in a heat-assisted magnetic recording (HAMR) process;
- manipulating a laser data signal via a circuit prior to providing the laser data signal to a preamp;
- sending the laser data signal to the preamp;
- manipulating the laser data current in the preamp based on the laser data signal and settings of the preamp;
- generating the laser current with the preamp;
- driving a laser with the laser current;
- determining if the settings of the preamp need to be changed;
- reprogramming the settings of the preamp when they need to be changed;
- and
- generating the laser current with the reprogrammed preamp.
Dependencies are inferred from the claim text.