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US 2015/0138937 A1Published application
Self-controlled laser pulsing for thermally assisted recording
AssigneeHGST Netherlands B.V.
InventorsNaoto Ito, Michiya Kazusawa, Hiroyasu Tanabe, Sarbanoo Das, Hideki Zaitsu
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Abstract
A method of storing data includes providing a write signal for a write head of a hard disk drive, generating a transition pulse signal derived from the write signal using a transition pulse generator, and generating a logic signal to drive a thermal source associated with the write head of the hard disk drive. The logic signal includes the logical summation of a cyclical base pulse signal and the transition pulse signal.
Claims21
A method of storing data, the method comprising:
- providing a write signal for a write head of a hard disk drive;
- generating a transition pulse signal derived from the write signal using a transition pulse generator;
- configuring a pulse shaping register to store the characteristics of a cyclical base pulse signal, comprising the frequency, pulse width and pulse interval;
- and
- generating a logic signal to drive a thermal source associated with the write head of the hard disk drive, the logic signal comprising the logical summation of the cyclical base pulse signal and the transition pulse signal;
- wherein the characteristics of the base pulse signal are controlled by the pulse shaping register.
3 more elements
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A preamplifier comprising:
- an input to receive a write signal;
- a transition pulse generator to generate a transition pulse signal based on the write signal;
- a pulse shaping register to store the characteristics of a base pulse signal, comprising the frequency, pulse width and pulse interval;
- a base pulse generator to generate the cyclical base pulse signal, wherein the characteristics of the cyclical base pulse signal are controlled by the pulse shaping register;
- a summation circuitry to generate a logic signal based on the logical summation of the transition pulse signal and the base pulse signal;
- and
- a drive amplifier to receive the logic signal and to provide a current signal based on the logic signal to a thermal source associated with a write head.
4 more elements
A hard drive system comprising:
- a drive medium;
- a write head associated with the drive medium, the write head associated with a thermal source;
- a control circuit including a write data generator to generate a write signal;
- and
- a preamplifier in communication with the control circuit, the preamplifier comprising:
- an input to receive a write signal;
- a transition pulse generator to generate a transition pulse signal based on the write signal;
- a pulse shaping register to store the characteristics of a base pulse signal, comprising the frequency, pulse width and pulse interval;
- a base pulse generator to generate the cyclical base pulse signal, wherein the characteristics of the cyclical base pulse signal are controlled by the pulse shaping register;
- a summation circuitry to generate a logic signal based on the logical summation of the transition pulse signal and the base pulse signal;
- and
- a drive amplifier to receive the logic signal and to provide a current signal based on the logic signal to a thermal source associated with a write head.
9 more elements
Dependencies are inferred from the claim text.