Determining absolute position on HDD spiral patterns using dual TDMR readers
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsGary W. Calfee, Gabor Szita, Jiangang Liang
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Abstract
A method of determining radial position of a magnetic head that includes a first read sensor and a second read sensor includes: with the first read sensor, detecting a servo spiral formed on a disk; with the second read sensor, detecting the servo spiral; measuring a time interval between when the servo spiral is detected by the first read sensor and when the servo spiral is detected by the second read sensor; and based on the time interval, determining a radial position of the magnetic head relative to the disk.
Claims20
A method of determining radial position of a magnetic head that includes a first read sensor and a second read sensor, the method comprising:
- with the first read sensor, detecting a servo spiral formed on a disk;
- with the second read sensor, detecting the servo spiral;
- measuring a time interval between when the servo spiral is detected by the first read sensor and when the servo spiral is detected by the second read sensor;
- and
- based on the time interval, determining a radial position of the magnetic head relative to the disk.
A disk drive, comprising:
- a magnetic head having first and second read sensors;
- a disk medium with a first surface on which at least one servo spiral is formed;
- and
- a controller configured to perform the steps of:
- with the first read sensor, detecting a servo spiral formed on a disk;
- with the second read sensor, detecting the servo spiral;
- measuring a time interval between when the servo spiral is detected by the first read sensor and when the servo spiral is detected by the second read sensor;
- and
- based on the time interval, determining a radial position of the magnetic head relative to the disk.
Dependencies are inferred from the claim text.