Method and apparatus for controlling a write current in a hard disk drive

A method of controlling a current in a hard disk drive, the method comprising:

• applying an overshoot current and a write current to a head of the hard disk drive, to write data on a disk of the hard disk drive;
• and
• changing the overshoot current and the write current when an adjacent track erasure (ATE) property of the head exceeds a threshold.
• wherein the ATE property of the head corresponds to a saturation of a thermal pole-tip protrusion (TPTP) of the head.

A method of controlling a current in a hard disk drive, the method comprising:

• applying an overshoot current and a write current to a head of the hard disk drive, to write data on a disk of the hard disk drive;
• and
• changing the overshoot current and the write current when an adjacent track erasure (ATE) property of the head exceeds a threshold,
• wherein the changing of the overshoot current is performed in predetermined steps, and
• wherein the predetermined steps depend on an assigned profile, of a plurality of profiles, forthe head.

A method of controlling a current in a hard disk drive, the method comprising:

• applying an overshoot current and a write current to a head of the hard disk drive, to write data on a disk of the hard disk drive;
• and
• changing the overshoot current and the write current when an adjacent track erasure (ATE) property of the head exceeds a threshold,
• wherein the changing of the overshoot current occurs after a predetermined period of time, with that predetermined period of time being the time between a writing start point and the ATE property of the head exceeding a threshold.

A method of controlling a current in a hard disk drive, the method comprising:

• applying an overshoot current and a write current to a head of the hard disk drive, to write data on a disk of the hard disk drive;
• and
• changing the overshoot current and the write current when an adjacent track erasure (ATE) property of the head exceeds a threshold,
• wherein the changing of the overshoot current occurs after a predetermined period of time, with that predetermined period of time being the time between a writing start point and a thermal pole-tip protrusion (TPTP) of the head saturating.

A method of controlling a current in a hard disk drive, the method comprising:

• applying an overshoot current and a write current to a head of the hard disk drive, to write data on a disk of the hard disk drive;
• and
• changing the overshoot current and the write current when an adjacent track erasure (ATE) property of the head exceeds a threshold,
• wherein the applying the overshoot current and the write current to the head of the hard disk drive further comprises:
• performing a data writing operation to a to-be-tested track;
• performing a data writing operation on tracks adiacent to the to-be-tested track;
• reading data from the to-be-tested track, detecting a number of errors read from the to-be-tested track, and comparing the detected number of errors to an error threshold value to determine the ATE property of the head, and
• wherein the performing of data writing operation to the to-be-tested track includes reading data from the to-be-tested track to assign optimal overshoot and write currents to satisfy a predetermined bit error rate.