System method and device for generating a temperature compensated write current during disk drive write operations
AssigneeSeagate Technology LLC
InventorsJames Lai Kein Chang, Myint Ngwe, Kah Liang Gan, Beng Wee Quak
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Abstract
A system, method, and device for sensing temperature during the writing of information onto magnetic media and providing a sufficient write current for that temperature is disclosed. The system comprises a head responsive to a write current for generating a magnetic flux used in writing data onto the magnetic media, a write current source coupled to the head for receiving a write signal and providing write current to the head, and a temperature responsive device coupled to the write current source that senses temperature and provides a write signal whose magnitude is dependent on temperature.
Claims25
A system for sensing temperature during writing of information onto magnetic media and providing a sufficient write current for the sensed temperature, the system comprising:
- a head responsive to a write current for generating a magnetic flux used in writing data onto magnetic media;
- a write current source coupled to the head for receiving a write signal and providing write current to the head, wherein the magnitude of the write current is controlled by the write signal;
- and
- a temperature responsive device coupled to the write current source that senses temperature and provides a write signal having a magnitude dependent on temperature, the temperature responsive device comprising:
- a first variable resistance device coupled between a first reference voltage and an output node for fine adjustment of the write signal, wherein the output node is coupled to the write current source and communicates the write signal to the write current source;
- a second variable resistance device coupled between the output node and a second reference voltage for coarse adjustment of the write signal;
- and
- a coarse adjust input coupled to the second variable resistance device for adjusting the resistance of the second variable resistance device.
A method of sensing temperature during the writing of information onto magnetic media and generating a write current and a magnetic field in the vicinity of the magnetic media sufficient to write information onto the magnetic media at that temperature, the method comprising:
- automatically sensing temperature using a first variable resistance device coupled between a first reference voltage and an output node for fine adjustment of a write signal;
- sending a control signal to a second variable resistance device coupled between the output node and a second reference voltage to configure the second variable resistive device for coarse adjustment of the write signal;
- producing a write current dependent on the magnitude of the write signal;
- and
- inducing a magnetic flux responsive to the write current in a head positioned in the vicinity of the magnetic media.
A temperature responsive device for providing a temperature-compensated write signal during the writing of information to magnetic media, the temperature responsive device comprising:
- a first variable resistance device coupled between a first reference voltage and an output node for fine adjustment of the write signal, wherein the output node is coupled to the write signal;
- a second variable resistance device coupled between the output node and a second reference voltage for coarse adjustment of the write signal;
- and
- a coarse adjust input coupled to the second variable resistance device for adjusting the resistance of the second variable resistance device.
Dependencies are inferred from the claim text.