Storage medium device, deformation controller and head slider

1. A storage medium device having at least a head which includes a read head element and a write head element, the device comprising:

a deformable element which changes a distance between the read head element and the write head element in a circumferential direction;

a storage unit which stores a control value to be applied to the deformable element in association with each target track for writing; and

a deformation controller which acquires the control value corresponding to the target track for the writing from the storage unit, and applies the acquired control value to the deformable element.

2. The storage medium device according to claim 1 , wherein

the storage unit stores a control value for controlling the deformable element so that the read head element is positioned on any track, when the write head element is positioned on the target track selected for writing.

3. The storage medium device according to claim 2 , wherein

the deformation controller selects a control value having a least difference value with a present control value, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

4. The storage medium device according to claim 2 , wherein

the deformation controller selects a control value for obtaining a minimum seek difference, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

5. The storage medium device according to claim 2 , further comprising:

a control value optimizer which obtains such a control value as to obtain a highest S/N ratio of a signal to be read by the read head element, when the write head element is positioned on a certain track, and stores the obtained control values in the storage unit in association with the track on which the write head element is positioned.

6. The storage medium device according to claim 1 , wherein

the storage unit stores a control value for controlling the deformable element so that the difference between the timing at which the read head element reads a signal and a timing at which the write head element performs the writing is uniform, in association with each target track selected for writing.

7. The storage medium device according to claim 6 , wherein

the deformation controller selects a control value having a least difference value with a present control value, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

8. The storage medium device according to claim 6 , wherein

the deformation controller selects a control value for obtaining a minimum seek difference, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

9. The storage medium device according to claim 6 , further comprising:

a control value optimizer which obtains such a control value as to obtain a highest S/N ratio of a signal to be read by the read head element, when the write head element is positioned on a certain track, and stores the obtained control value in the storage unit in association with the track on which the write head element is positioned.

10. The storage medium device according to claim 1 , wherein

the deformation controller selects a control value having a least difference value with a present control value, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

11. The storage medium device according to claim 1 , wherein

the deformation controller selects a control value for obtaining a minimum seek difference, when a plurality of control values corresponding to the target track selected for writing are acquired from the storage unit.

12. The storage medium device according to claim 1 , further comprising:

a control value optimizer which obtains such a control value as to obtain a highest S/N ratio of a signal to be read by the read head element, when the write head element is positioned on a certain track, and stores the obtained control value in the storage unit in association with the track on which the write head element is positioned.

13. A deformation controller device for controlling a deformable element provided for changing a distance between a read head element and a write head element in a circumferential direction, in a storage medium device having at least a head which includes the read head element and the write head element, the deformation controller device comprising:

a target track acquisition unit which acquires information regarding a target track for writing;

a control value acquisition unit which acquires a control value corresponding to the track included in the information acquired by the target track acquisition unit from a storage unit which stores a control value to be applied to the deformable element in association with each target track; and

a deformable element controller which applies the control value acquired by the control value acquisition unit to the deformable element.

14. The deformation controller device according to claim 13 , further comprising:

a control value selector which selects a control value having a least difference value with a present control value, when a plurality of control values corresponding to the target track are acquired by the control value acquisition unit.

15. The deformation controller device according to claim 13 , further comprising:

a control value selector which selects a control value for obtaining a minimum seek difference, when a plurality of control values corresponding to the target track are acquired by the control value acquisition unit.