Reducing non-coherent repeatable runout in two-dimensional magnetic recording disk drives
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorGabor Szita
Life of this patent
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Abstract
A method for positioning a magnetic head having first and second read sensors and one write head includes: while the magnetic head is at a first position relative to a disk medium, reading first magnetic servo information written on a first surface of the disk medium, with the first read sensor, and reading second magnetic servo information written on the first surface of the disk medium with the second read sensor; determining a position error of the magnetic head based on the first and second magnetic servo information; and repositioning the magnetic head to a second position relative to the disk medium to compensate for the determined position error of the magnetic head.
Claims13
A method of positioning a magnetic head of a disk drive having first and second read sensors and one write head, said method comprising:
- while the magnetic head is at a first position relative to a disk medium, reading first magnetic servo information written on a first surface of the disk medium, with the first read sensor, and reading second magnetic servo information written on the first surface of the disk medium with the second read sensor;
- determining a position error of the magnetic head based on the first and second magnetic servo information;
- and
- repositioning the magnetic head to a second position relative to the disk medium to compensate for the determined position error of the magnetic head;
- wherein the first and second magnetic servo information are included in a single servo spiral.
A disk drive, comprising:
- a magnetic head having first and second read sensors and one write head;
- a disk medium with a first surface on which magnetic servo information is written;
- and
- a controller configured to perform the steps of:
- while the magnetic head is at a first position relative to a disk medium, reading first magnetic servo information written on a first surface of the disk medium, with the first read sensor, and reading second magnetic servo information written on the first surface of the disk medium with the second read sensor;
- determining a position error of the magnetic head based on the first and second magnetic servo information;
- and
- repositioning the magnetic head to a second position relative to the disk medium to compensate for the determined position error of the magnetic head,
- wherein the first and second magnetic servo information are included in a single servo spiral.
Dependencies are inferred from the claim text.