Information recording/reproduction apparatus, head levitation height control method and head levitation control circuit

An information recording/reproduction apparatus having a head that performs recording or reproduction of information on/from a recording medium, comprising:

• a first drive section that changes the levitation height of the head relative to the recording medium based on a first drive method;
• a second drive section that changes the levitation height of the head relative to the recording medium based on a second drive method different from the first drive method;
• a levitation height measurement section that measures the head levitation height;
• and
• a controller that controls the first and second drive sections based on the levitation height measured by the levitation height measurement section,
• wherein the first drive section is so deformed as to reduce the levitation height of the head, and
• the second drive section is so deformed as to increase the levitation height of the head.

A head levitation height control method that controls the levitation height of a head that performs recording or reproduction of information on/from a recording medium, comprising:

• a levitation height measurement step that measures the head levitation height;
• and
• a control step that controls the head levitation height relative to the recording medium with a first drive section based on a first drive method as well as controls the head levitation height relative to the recording medium with a second drive section based on a second drive method different from the first drive method,
• wherein waviness of various cycles exists on a surface of the recording medium, and
• the control step allows the first drive section to follow waviness having a cycle of a first given range and allows the second drive section to follow waviness having a cycle of a second given range which is smaller than the first given range.

A head levitation control circuit that controls a levitation height of a head that performs recording or reproduction of information on/from a recording medium, comprising:

• a first drive section that changes the levitation height of the head based on a first drive method;
• a second drive section that changes the levitation height of the head based on a second drive method different from the first drive method;
• a levitation height measurement section that measures the head levitation height;
• and
• a controller that controls the first and second drive sections based on the head levitation height measured by the levitation height measurement section,
• wherein waviness of various cycles exists on a surface of the recording medium, and
• the controller allows the first drive section to follow waviness having a cycle of a first given range and allows the second drive section to follow waviness having a cycle of a second given range which is smaller than the first given range.