Hard disk drive apparatus, method to control flying on demand of hard disk drive apparatus using thermal asperity signal, and recording media for computer program thereof

A computer-readable recording medium having embodied thereon a computer program to execute a method, wherein the method comprises:

• providing at least one protrusion having a predetermined height on a disk, moving a magnetic head to a position of the protrusion, and applying an FOD voltage for a test to the magnetic head;
• detecting a thermal asperity (TA) signal generated when the magnetic head touches the protrusion by the applied FOD voltage for a test;
• and
• determining the maximum FOD voltage applied to the magnetic head based on the detected TA signal and determining an FOD voltage to control the FH (flying height) of the magnetic head based on the maximum FOD voltage.

A hard disk drive apparatus, comprising:

• one or more disks;
• a magnetic head to record data to or reproduce data from the one or more disks;
• and
• a controller to actively control a flying height of the magnetic head with respect to a respective disk to increase reliability of at least one of a read operation and a write operation based on a thermal asperity (TA) signal:
• wherein the controller controls the flying height of the magnetic head based on the thermal asperity signal by moving the magnetic head to a position of the respective disk and applying an FOD voltage for a test to the magnetic head detecting the TA signal generated when the magnetic head contacts the respective disk by the applied FOD voltage, determining the maximum FOD voltage applied to the magnetic head based on the detected TA signal and determining an FOD voltage to control the FH (flying height) of the magnetic head based on the maximum FOD voltage.