Method and apparatus for determining offset between read head and write head in a disk drive
AssigneeKabushiki Kaisha Toshiba
InventorDaisuke SUDO
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a disk drive is disclosed which has an offset measuring function for measuring a dynamic offset value necessary to a dynamic offset control using a DTM type disk. A CPU included in the disk drive writes offset measuring position information to an optimum position of lands on the disk and calculates a dynamic offset value based on the offset measuring position information.
Claims13
A disk drive comprising:
- a discrete track media type disk comprising data regions and servo regions, the data regions comprising magnetic recording regions of data and non-magnetic regions separate from the magnetic recording regions, and the servo regions comprising servo information;
- a magnetic head comprising a write head and a separate read head;
- an actuator on which the magnetic head is mounted and configured to move the magnetic head in a radial direction on the disk;
- and
- a controller configured to control the actuator and to position the magnetic head to a position designated on the disk,
- wherein the controller is configured to write offset measuring position information for measuring a dynamic offset value to a first position in the magnetic regions on the disk,
- the controller is configured to calculate the dynamic offset value using the offset measuring position information, and
- the controller is configured to control an offset based on the dynamic offset value when the magnetic head is positioned to a designated position on the disk according to either a data write operation or a data read-out operation.
A method of determining an offset in a disk drive comprising a discrete track media type disk comprising data regions and servo regions, the data regions comprising magnetic recording regions of data and non-magnetic regions arranged separately from the magnetic recording region, and the servo regions comprising servo information recorded to the servo regions and a magnetic head comprising a write head and a separate read head, the method comprising:
- writing offset measuring position information for measuring a dynamic offset value used in a dynamic offset control to a first position comprised in the magnetic regions on the disk;
- and
- calculating the dynamic offset value using the offset measuring position information recorded to the first position.
Dependencies are inferred from the claim text.