Data storage device, data write method, and program

1. A data storage device, comprising:

a write head for writing data onto a magnetic disk;

a write circuit configured to generate the write current to be supplied to said write head by using a supplied positive voltage and a supplied negative voltage;

a converter configured to generate said negative voltage to be supplied to said write circuit from said positive voltage; and

a programmable controller configured to variably set the magnitude of said negative voltage based on information input to said controller;

wherein said controller sets the magnitude of said negative voltage in accordance with an ambient temperature for said magnetic disk.

2. The data storage device according to claim 1 , wherein said controller sets a large absolute value for said negative voltage if said ambient temperature is low, and sets a small absolute value for said negative voltage if said ambient temperature is high.

3. The data storage device according to claim 1 , wherein said controller changes the magnitude of said negative voltage when said write head is not performing a write operation.

4. The data storage device according to claim 1 , wherein said write circuit ensures that the write current value used for a specified period after the start of a write is greater than the write current value used after the elapse of the specified period.

5. The data storage device according to claim 1 , wherein said write circuit isof a voltage-driven type that directly provides voltage drive for said write head.

6. The data storage device according to claim 1 , wherein said converter comprises a register for storing a voltage command from said controller and a voltage converter for converting the voltage in accordance with the value stored in said register.

7. The data storage device of claim 1 , wherein said controller uses stored voltage command information in a register to variably set the magnitude of said negative voltage.

8. The data storage device of claim 7 , wherein the magnitude of said negative voltage is set to a predefined voltage defined by said stored voltage command information.

9. A data storage device comprising:

a write head for writing data onto a magnetic disk;

a write circuit configured to generate the current to be supplied to said write head by using a supplied positive voltage and a supplied negitive voltage;

a converter configured to generate said negative voltage to be supplied to said write circuit from said positive voltage; and

a programmable controller configured to variably set the magnitude of said negative voltage based on information input to said controller;

wherein said controller sets the magnitude of said negative voltage in accordance with the magnitude of said positive voltage;

wherein said controller sets a large absolute value for said negative voltage if said positive voltage is low, and sets a small absolute value for said negative voltage if said positive voltage is high.

10. A data write method, comprising:

receiving a seek command or a write command for a read/write head over a magnetic disk;

setting by a controller the magnitude of the negative voltage to be supplied to a drive circuit for said read/write head in accordance with a specified condition based on information input to the controller, the negative voltage being generated from a positive voltage supplied to the drive circuit; and

causing said read/write head over said magnetic disk to perform a seek operation or a write operation;

wherein said specified condition is the ambient temperature for said magnetic disk.

11. The data write method according to claim 10 , wherein said second step sets a large absolute value for said negative voltage if said ambient temperature is low and sets a small absolute value for said negative voltage if said ambient temperature is high.

12. A data write method comprising:

receiving a seek command or a write command for a read/write head over a magnetic disk;

setting by a controller the magnitude of a negative voltage to be supplied to a drive circuit for said read/write head in accordance with a specified condition based on information input to the controller, the negative voltage being generated from a positive voltage supplied to the drive circuit; and

causing said read/write head over said magnetic disk to perform a seek operation or a write operation;

wherein said specified condition is the magnitude of said supplied positive voltage;

wherein said second step sets a large absolute value for said negative voltage if said positive voltage is low and sets a small absolute value for said negative voltage if said positive voltage is high.

13. A data storage device, comprising:

a write head for writing data onto a magnetic disk:

a write circuit configured to generate the write current to be supplied to said write head by using a supplied positive voltage and a supplied negative voltage;

a converter configured to generate said negative voltage to be supplied to said write circuit from said positive voltage; and

a programmable controller configured to variably set the magnitude of said negative voltage based on information input to said controller;

wherein said controller sets the magnitude of said negative voltage in accordance with the average value of said positive voltage.

14. The data storage device according to claim 13 , wherein said controller changes the magnitude of said negative voltage when said write head is not performing a write operation.

15. The data storage device according to claim 13 , wherein said write circuit ensures that the write current value used for a specified period after the start of a write is greater than the write currant value used after the elapse of the specified period.

16. The data storage device according to claim 13 , wherein said write circuit is of a voltage-driven type that directly provides voltage drive for said write head.

17. The data storage device according to claim 13 , wherein said converter comprises a register for storing a voltage command from said controller and a voltage converter for converting the voltage in accordance withthe value stored in said register.

18. The data storage device according to claim 13 , wherein said controller uses stored voltage command information in a register to variably set the magnitude of said negative voltage.

19. A data write method, comprising:

receiving a seek command or a write command for a read/write head over a magnetic disk;

setting by a controller the magnitude of a negative voltage to be supplied to a drive circuit for said read/write head in accordance with a specified condition based on information input to the controller, the negative voltage being generated from a positive voltage supplied to the drive circuit;

causing said read/write head over said magnetic disk to perform a seek operation or a write operation; and

prior to causing the read/write head to perform the seek operation or the write operation:

storing values of previous positive and negative voltages;

measuring the value of a supplied positive voltage; and

computing the difference between the value of said supplied positive voltage and the value of said previous positive voltage;

wherein said specified condition used in setting the magnitude of the negative voltage is the computed difference.

20. The method of claim 19 , further comprising waiting for a preset period of time to allow the voltage to stabilize after setting the magnitude of the negative voltage before causing the read/write head to perform the seek operation or the write operation.