Disk apparatus, information processing system, and information providing apparatus

1. A disk apparatus having a first disk on which servo information is formed, the disk apparatus comprising:

a storing unit that stores first correction information for correcting a distortion synchronized with a rotation frequency of the servo information, the first correction information being measured based on the servo information of the first disk; and

a control unit that controls positioning of a head on a target track by correcting the servo information of the first disk with the first correction information stored in the storing unit, wherein

measurement information that is used for measuring the first correction information is calculated based on second correction information for correcting a distortion synchronized with the rotation frequency of the servo information in other disk apparatus including a second disk on which the servo information is formed using a common master medium with the first disk.

2. The disk apparatus according to claim 1 , further comprising:

an input unit that inputs the measurement information from an external apparatus; and

a measuring unit that measures the first correction information, using the measurement information input by the input unit, wherein

the storing unit stores the measurement information input by the input unit, transmits the measurement information to the measuring unit when the measuring unit measures the first correction information, and stores the first correction information measured by the measuring unit.

3. The disk apparatus according to claim 2 , wherein

the measuring unit sets the measurement information as an initial correction value when measuring the first correction information.

4. The disk apparatus according to claim 1 , wherein

a plurality of other disk apparatuses is provided, and

the measurement information is calculated based on a plurality of pieces of second correction information measured by the other disk apparatuses.

5. The disk apparatus according to claim 4 , wherein

the measurement information is an average of the pieces of second correction information.

6. The disk apparatus according to claim 2 , further comprising:

an output unit that outputs the first correction information measured by the measuring unit to the external apparatus.

7. The disk apparatus according to claim 2 , wherein

the second correction information is measured for each track of the second disk,

the input unit inputs the measurement information that is calculated based on the second correction information for each track of the second disk from the external apparatus, and

the measuring unit measures the first correction information for each track of the first disk, using the measurement information input by the input unit.

8. The disk apparatus according to claim 2 , wherein

the input unit inputs the measurement information for a track corresponding to the first correction information measured by the measuring unit each time the measuring unit measures the first correction unit from the external apparatus.

9. The disk apparatus according to claim 2 , wherein

the input unit collectively inputs a plurality of pieces of measurement information for tracks corresponding to the first correction information measured by the measuring unit from the external apparatus,

the storing unit stores the pieces of measurement information, and

the measuring unit sequentially measures the first correction information for each of the tracks, using the pieces of measurement information stored in the storing unit.

10. The disk apparatus according to claim 2 , wherein

the input unit is connected to the external apparatus when inputting the measurement information, and disconnected from the external apparatus when the measuring unit measures the first correction information.

11. The disk apparatus according to claim 6 , wherein

the output unit is connected to the external apparatus when the outputting the first correction information measured by the measuring unit to the external apparatus.

12. The disk apparatus according to claim 1 , wherein

the first correction information and the second correction information include a component that is mutually different between the tracks, obtained by eliminating a component that is common between the tracks.

13. The disk apparatus according to claim 1 , wherein

each of the first correction information and the second correction information is used for correcting the distortion synchronized with the rotation frequency of the servo information by following a distortion on a track.

14. The disk apparatus according to claim 1 , wherein

each of the first correction information and the second correction information is used for correcting the distortion synchronized with the rotation frequency of the servo information by following a virtual track, without following a distortion on a track.

15. An information processing system comprising:

a disk apparatus having a first disk on which servo information is formed, wherein

the disk apparatus includes

a storing unit that stores first correction information for correcting a distortion synchronized with a rotation frequency of the servo information, the first correction information being measured based on the servo information of the first disk; and

a control unit that controls positioning of a head on a target track by correcting the servo information of the first disk with the first correction information stored in the storing unit, and

measurement information that is used for measuring the first correction information is calculated based on second correction information for correcting a distortion synchronized with the rotation frequency of the servo information in other disk apparatus including a second disk on which the servo information is formed using a common master medium with the first disk.

16. An information providing apparatus comprising:

a storing unit that stores information for correcting a distortion synchronized with a rotation frequency of servo information in a second disk apparatus including a second disk on which the servo information is formed, as second correction information; and

a transmitting unit that transmits, when a first disk apparatus including a first disk on which the servo information is formed using a common master medium with the second disk measures information for correcting a distortion synchronized with the rotation frequency of the servo information, as first correction information, information calculated based on the second correction information to the first disk apparatus as measurement information.

17. The information providing apparatus according to claim 16 , wherein

a plurality of second disk apparatuses is provided, and

the information providing apparatus further comprises a calculating unit that calculates the measurement information, using a plurality of pieces of second correction information measured by the second disk apparatuses and stored in the storing unit.

18. The information providing apparatuses according to claim 16 , further comprising:

a receiving unit that receives the first correction information from the first disk apparatus, wherein

the storing unit stores the first correction information received by the receiving unit together with the second correction information.

19. The information providing apparatus according to claim 17 , wherein

the second correction information is measured for each track of the second disk, and

the transmitting unit transmits the measurement information calculated by the calculating unit for each track to the first disk apparatus.

20. The information providing apparatus according to claim 16 , wherein

the transmitting unit transmits the measurement information for a track corresponding to the first correction information measured by the first disk apparatus to the first disk apparatus each time the first disk apparatus measures the first correction information.

21. The information providing apparatus according to claim 16 , wherein

the transmitting unit collectively transmits a plurality of pieces of measurement information for tracks corresponding to the first correction information measured by the first disk apparatus to the first disk apparatus.

22. The information providing apparatus according to claim 16 , wherein

the transmitting unit is connected to the first disk apparatus when transmitting the measurement information, and disconnected from the first disk apparatus when the first disk apparatus measures the first correction information.

23. The information providing apparatus according to claim 18 , wherein

the receiving unit is connected to the first disk apparatus when receiving the first correction information from the first disk apparatus.

24. A disk-apparatus correcting system that causes a first disk apparatus including a first disk on which servo information is formed to measure information for correcting a distortion synchronized with a rotation frequency of the servo information as first correction information, the disk-apparatus correcting system comprising:

a storing unit that stores information for correcting a distortion synchronized with the rotation frequency of the servo information of a second disk apparatus including a second disk on which the servo information is formed using a common master medium with the first disk, as second correction information in advance, wherein

the first disk apparatus uses information calculated based on the second correction information stored in the storing unit, as measurement information when measuring the first correction information.

25. The disk-apparatus correcting system according to claim 24 , wherein

the first disk apparatus sets the measurement information as an initial correction value when measuring the first correction information.

26. The disk-apparatus correcting system according to claim 24 , wherein

a plurality of second disk apparatuses is provided,

the disk-apparatus correcting system further comprises a calculating unit that calculates the measurement information using a plurality of pieces of second correction information stored in the storing unit, and

the first disk apparatus uses the measurement information calculated by the calculating unit when measuring the first correction information.

27. The disk-apparatus correcting system according to claim 24 , wherein

the storing unit stores the first correction information measured by the first disk apparatus together with the second correction information.

28. A method of manufacturing a disk apparatus by writing servo information on a first disk and mounting the first disk on which the servo information is written into the disk apparatus, the method comprising:

acquiring, from a second disk apparatus including a second disk on which the servo information is formed using a common master medium with the first disk, information for correcting a distortion synchronized with the rotation frequency of the servo information in the second disk apparatus, as second correction information;

calculating, based on the second correction information, measurement information that is used by a first disk apparatus including the first disk when measuring the first correction information for correcting a distortion synchronized with the rotation frequency of the servo information in the first disk apparatus; and

measuring including

inputting the measurement information to the first disk apparatus; and

causing the first disk apparatus to measure the first correction information.

29. The manufacturing method of disk apparatuses according to claim 28 , wherein

the measuring including setting the measurement information as an initial correction value when measuring the first correction information.

30. A control apparatus that controls positioning of a head on a track of a first disk on which servo information is formed, the control apparatus comprising:

a storing unit that stores first correction information for correcting a distortion synchronized with a rotation frequency of the servo information, the first correction information being measured based on the servo information of the first disk; and

a control unit that controls the positioning of the head on a target track by correcting the servo information of the first disk with the first correction information stored in the storing unit, wherein

measurement information that is used for measuring the first correction information is calculated based on second correction information for correcting a distortion synchronized with the rotation frequency of the servo information in other disk apparatus including a second disk on which the servo information is formed using a common master medium with the first disk.