Method to control flying height between a head and a disk and apparatus thereof

An apparatus to control changes in a flying height between a write head and a disk surface of a hard disk drive, comprising:

• a write current control unit to control the magnitude of a write current provided to the head of the hard disk drive in accordance with changes in temperature;
• an overshoot control unit to change an overshoot value of the write current at each magnitude of the write current;
• a signal analyzing unit to determine whether the head and the disk surface of the hard disk drive are in contact in relation to the changes of the write current controlled via the write current control unit, and changes of the overshoot value of the write current controlled via the overshoot control unit;
• and
• a threshold storing unit to store thresholds of the write current and the overshoot value analyzed via the signal analyzing unit.

A computer readable medium having embodied thereon a computer program to perform a method, comprising:

• changing a write current or an overshoot value of the write current in relation to a temperature;
• determining whether a head and a disk surface of a hard disk drive are in contact in relation to changes of the write current or the overshoot value of the write current;
• and
• setting the write current and the overshoot value of the write current as a threshold upon determining that the head and disk surface are in contact.

A method to control changes in a flying height between a write head and a disk, comprising:

• changing a magnitude of a write current in relation to a temperature;
• changing an overshoot value in relation to each magnitude change of the write current;
• sensing changes of the head and the disk;
• analyzing the changes of the head and the disk to determine whether the disk and the head are in contact;
• and
• setting the write current and the overshoot value of the write current as threshold upon determining that the disk and the head are in contact.