RECORDING CURRENT OPTIMIZATION METHOD OF HARD DISK DRIVE, RECORDING MEDIUM STORING PROGRAM TO EXECUTE THE METHOD AND APPARATUS EMPLOYING THE SAME

• US 20070115575A1
• Filed: 11/17/2006
• Published: 05/24/2007
• Est. Priority Date: 11/18/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Sung-youn, Hong, Kyung-ho
• Granted Patent: US 7,636,213 B2
• Time in Patent Office: Days
• US Class Current: 360/46
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/10027 adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers optimum power control for optical discs G11B7/125
• CPC Class Codes: G11B 20/10194 using predistortion during writing G11B20/10055 takes precedence
• CPC Class Codes: G11B 20/10481 optimisation methods
• CPC Class Codes: G11B 2005/001 Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
• CPC Class Codes: G11B 2220/2516 Hard disks
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Abstract

A recording current optimization method to optimize a recording current according to a change of a driving voltage applied to a pre-amplifier that generates the recording current supplied to a head, a recording medium storing a program that executes the method, and an apparatus that employs the method. The method of optimizing the recording current provided to the recording head of the hard disk drive includes detecting a driving voltage of the pre-amplifier, determining a voltage difference between the detected driving voltage and a reference driving voltage of the pre-amplifier, and optimizing the recording current according to the determined voltage difference. The recording current is adaptively optimized according to the change of the pre-amplifier driving power to provide the recording current to the head such that adjacent track erasure (ATE) and weak write (WW) are prevented from occurring due to the change of the driving power.

Claims

1. A method of optimizing a recording current provided to a recording head of a hard disk drive, the method comprising:

optimizing the recording current according to a change of a driving voltage of a pre-amplifier generating the recording current.

2. The method of claim 1, wherein the optimizing of the recording current comprises:

detecting the driving voltage of the pre-amplifier;

determining a voltage difference between the detected driving voltage and a reference driving voltage; and

adjusting the recording current according to the determined voltage difference.

3. The method of claim 2, wherein the adjustment of the recording current comprises adjusting the recording current in inverse proportion to the determined voltage difference.

4. The method of claim 3, wherein the adjustment of the recording current comprises adjusting the recording current by referring to a compensation table that stores the voltage difference and a recording current compensation value corresponding to the stored voltage difference.

5. The method of claim 2, wherein the optimizing of the recording current further comprises:

recording data on a disk with the adjusted recording current;

reading the recorded data to detect a gain of the pre-amplifier; and

determining a gain difference between the detected gain and a reference gain of the pre-amplifier and adjusting the recording current based on the determined gain difference,

wherein the determined gain difference is minimized by the adjustment of the recording current.

6. The method of claim 5, wherein the adjustment of the recording current comprises:

adjusting the recording current according to the determined voltage difference by referring to a compensation table that stores the voltage difference and a recording current compensation value corresponding to the stored voltage difference; and

finely adjusting the recording current compensation value corresponding to the stored voltage difference according to the determined gain difference.

7. The method of claim 2, wherein:

the detecting of the driving voltage comprises detecting a positive driving voltage and a negative driving voltage;

the determining of the voltage difference comprises determining a positive voltage difference between the detected positive driving voltage and a reference positive driving voltage and a negative voltage difference between the detected negative driving voltage and a reference negative driving voltage, respectively; and

the adjustment of the recording current comprises adjusting the recording current according to the detected positive voltage difference and the detected negative voltage difference, respectively.

8. A recording medium having executable code stored thereon to perform a method of optimizing a recording current provided to a recording head of a hard disk drive, the method comprising:

optimizing the recording current according to a change of a driving voltage of a pre-amplifier generating the recording current by adjusting at least one of a DC (direct current) component of the recording current and an over shoot current (OSC) of the recording current.

9. A computer-readable recording medium having recorded thereon executable code to perform a method of optimizing a recording current provided to a recording head of a hard disk drive, the method comprising:

detecting a driving voltage of a pre-amplifier that generates the recording current;

determining a voltage difference between the detected driving voltage and a reference driving voltage of the pre-amplifier; and

optimizing the recording current according to the determined voltage difference.

10. The computer-readable recording medium of claim 9, wherein the optimizing of the recording current comprises adjusting the recording current in inverse proportion to the determined voltage difference.

11. The computer-readable recording medium of claim 10, wherein the optimizing of the recording current comprises adjusting the recording current by referring to a calibration table that stores the voltage difference and a recording current offset corresponding to the stored voltage difference.

12. The computer-readable recording medium of claim 9, the method further comprising:

recording data on a disk with the optimized recording current;

reading the recorded data to detect a gain of the pre-amplifier; and

determining a gain difference between the detected gain and a reference gain of the pre-amplifier and performing the optimizing of the recording current based on the determined gain difference such that the gain difference can be minimized.

13. The computer-readable recording medium of claim 12, wherein the optimizing of the recording current comprises adjusting the recording current according to the determined voltage difference by referring to a calibration table that stores the voltage difference and a recording current offset corresponding to the stored voltage difference and finely adjusting the recording current offset corresponding to the stored voltage difference according to the determined gain difference.

14. The computer readable medium of claim 9, wherein:

the detecting of the driving voltage comprises detecting a positive driving voltage and a negative driving voltage;

the determining of the voltage difference comprises determining a positive voltage difference between the detected positive driving voltage and a reference positive driving voltage and a negative voltage difference between the detected negative driving voltage and a reference negative driving voltage, respectively; and

the optimizing of the recording current comprises adjusting the recording current according to the determined positive voltage difference and the determined negative voltage difference, respectively.

15. The computer-readable recording medium of claim 9, wherein the optimizing of the recording current comprises adjusting at least one of a DC component of the recording current and an over shoot current (OSC) component of the recording current.

16. A hard disk drive comprising:

a head to write/read information to/from a disk in response to a recording current;

a pre-amplifier to generate the recording current provided to the head according to data provided from a read/write channel or to automatically control a gain of a reproducing current provided from the head to the read/write channel;

a voltage detector to detect a driving voltage applied to the pre-amplifier; and

a controller to optimize the recording current according to a voltage difference between the detected driving voltage of the pre-amplifier detected by the voltage detector and a reference driving voltage of the pre-amplifier.

17. The hard disk drive of claim 16, wherein the controller optimizes the recording current by referring to a calibration table that stores the voltage difference and a recording current offset corresponding to the stored voltage difference.

18. A hard disk drive, comprising:

at least one disk;

a head to read and/or write from and/or to the at least one disk;

a preamplifier to provide a current to the head such that the head operates based on the current; and

a controller to adjust at least one component of the current based on a detected driving voltage of the preamplifier.

19. The hard disk drive of claim 18, wherein the controller adjusts the at least one component of the current when the hard disk drive is initialized.

20. The hard disk drive of claim 18, wherein the controller compares the detected driving voltage to a reference voltage to determine a voltage difference and accesses a pre-stored table to determine a current correction value corresponding to the determined voltage difference from among a plurality of current correction values corresponding to a plurality of voltage differences.

21. The hard disk drive of claim 20, wherein the controller determines a gain with which the preamplifier amplifies data read from the at least one disk, compares the determined gain with a reference gain, calculates a difference between the determined gain and the reference gain, and when the calculated gain difference is less than a gain threshold, the controller finely adjusts the determined current correction value to minimize the calculated gain difference.

22. The hard disk drive of claim 18, wherein the preamplifier comprises:

a first register to store a DC component of the current provided to the head, the DC component stored in the first register being adjustable by a DC setting value write current (WC) signal provided by the controller; and

a second register to store an over shoot current of the current provided to the head, the over shoot current stored in the second register being adjustable by a OSC setting value (OSA) signal provided by the controller.

23. The hard disk drive of claim 18, wherein the adjusted at least one component of the current comprises one or more of a DC component of a recording current and an over shoot current of the recording current.

24. The hard disk drive of claim 18, wherein the at least one disk comprises:

a data zone in which data is read and recorded by the head; and

a burn in test area in which instructions for adjusting the at least one component of the current are recorded to be read by the head and provided to the controller.

25. A hard disk drive, comprising:

at least one disk;

a head to read and/or write from and/or to the at least one disk;

a preamplifier to provide a current to the head such that the head operates based on the current; and

a controller to determine a gain with which the preamplifier amplifies data read from the at least one disk and to adjust at least one component of the current provided to the head such that the gain of the preamplifier approaches a predetermined reference gain.

26. A hard disk drive, comprising:

at least one disk;

a head to read and/or write from and/or to the at least one disk;

a preamplifier to provide a recording current to the head such that the head operates based on the recording current; and

a controller to determine a driving voltage of the preamplifier, to perform a first adjustment operation on the recording current based on the determined driving voltage of the preamplifier, to determine a gain with which the preamplifier amplifies data read from the at least one disk, and to perform a second adjustment operation on the recording current based on the determined gain of the preamplifier.

27. A control apparatus of a hard disk drive having at least one disk and a head to read and/or write from and/or to the at least one disk, the apparatus comprising:

a preamplifier to provide a current to the head such that the head operates based on the current; and

a controller to adjust at least one component of the current provided by the preamplifier based on a detected driving voltage of the preamplifier.

28. A control apparatus of a hard disk drive having at least one disk and a head to read and/or write from and/or to the at least one disk, the apparatus comprising:

a preamplifier to provide a current to the head such that the head operates based on the current; and

a controller to determine a gain with which the preamplifier amplifies data read from the at least one disk and to adjust at least one component of the current provided to the head such that the gain of the preamplifier approaches a predetermined reference gain.

29. A method of optimizing a recording current in hard disk drive having at least one disk and a head to read and/or write from and/or to the at least one disk, the method comprising:

controlling a preamplifier to provide a current to the head such that the head operates based on the current; and

adjusting at least one component of the current provided by the preamplifier to the head based on a detected driving voltage of the preamplifier.

30. The method of claim 29, wherein the adjustment of the at least one component of the current is performed when the hard disk drive is initialized.

31. The method of claim 29, wherein the adjustment of the at least one component of the current comprises:

comparing the detected driving voltage to a reference voltage to determine a voltage difference; and

accessing a pre-stored table to determine a current correction value corresponding to the determined voltage difference from among a plurality of current correction values corresponding to a plurality of voltage differences.

32. The method of claim 31, wherein the adjustment of the at least one component of the current further comprises:

determining a gain with which the preamplifier amplifies data read from the at least one disk;

comparing the determined gain with a reference gain;

calculating a difference between the determined gain and the reference gain; and

when the calculated gain difference is less than a gain threshold, finely adjusting the determined current correction value to minimize the calculated gain difference.

33. The method of claim 29, further comprising:

storing a DC component of the current provided to the head in a first register of the preamplifier, the DC component stored in the first register being adjustable by a DC setting value write current (WC) signal transmitted to the first register; and

storing an over shoot current of the current provided to the head in a second register of the preamplifier, the over shoot current stored in the second register being adjustable by a OSC setting value (OSA) signal transmitted to the second register.

34. The method of claim 29, wherein the adjustment of the at least one component of the current comprises adjusting one or more of a DC component of a recording current and an over shoot current of the recording current.

35. The method of claim 29, wherein the adjustment of the at least one component of the current comprises reading instructions for adjusting the at least one component of the current from a burn in test area on the at least one disk.

36. A method of optimizing current in a hard disk drive having at least one disk and a head to read and/or write from and/or to the at least one disk, the method comprising:

controlling a preamplifier to provide a recording current to the head such that the head operates based on the recording current;

determining a driving voltage of the preamplifier;

performing a first adjustment operation on the recording current based on the determined driving voltage of the preamplifier;

determining a gain with which the preamplifier amplifies data read from the at least one disk; and

performing a second adjustment operation on the recording current based on the determined gain of the preamplifier.