Magnetic recording medium with laser-formed servo-marks
AssigneeSeagate Technology LLC
InventorsJialuo Jack Xuan, Thanh Duc Nguyen, Chung-Yuang Shih
Life of this patent
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Abstract
A magnetic recording medium is formed with a distribution of laser micromachined servo-marks in the form of pits or indentations with an attendant reduction in servo-tracking area and increased data-recording speed. Embodiments include laser texturing to form a radially extending linear or arcuate series of circular or elliptical pits across the data zone. The micromachined servo-marks are detected by mechanical or electrical means and denote the beginning and end of magnetically recorded servo-information in a data track, thereby enabling accurate and timely positioning of the read/write head by the servo-controller of the hard drive.
Claims12
A magnetic recording medium comprising a surface having:
- a data zone containing substantially concentric circumferentially extending data tracks with magnetically recorded servo-information;
- and
- a servo-track consisting essentially of a distribution of laser textured pits extending in a substantially radial direction to divide the data zone into a plurality of sectors, the pits, forming a plurality of servo-marks capable of being sensed to enable accurate reading of the servo-information and positioning of a read/write head in the data zone.
A magnetic recording medium comprising a surface having:
- a data zone containing substantially concentric circumferentially extending data tracks with magnetically recorded servo-information;
- and
- a servo-track comprising a distribution of laser textured pits extending in a substantially radial direction to divide the data zone into a plurality of sectors, the pits, forming a plurality of servo-marks capable of being sensed to enable accurate reading of the servo-information and positioning of a read/write head in the data zone wherein the distribution of pits comprises an arcuate series of pits.
A method of reading from or writing on a magnetic recording medium comprising a surface having:
- a data zone containing substantially concentric circumferentially extending data tracks with magnetically recorded servo-information;
- and a servo-track consisting essentially of a distribution of laser textured pits, extending in a substantially radial direction to divide the data zone into a plurality of sections, the pits forming a plurality of servo-marks capable of being sensed to enable accurate reading of the servo-information and positioning of a read/write head in the data zone, the method comprising:
- electrically or mechanically detecting one or more of the laser textured servo-marks on the surface of the magnetic recording medium;
- reading the magnetically recorded servo-information in a data track;
- and
- moving the read/write head to a particular position in the data zone in response to reading the servo-information.
A method of reading from or writing on a magnetic recording medium comprising a surface having:
- a data zone containing data tracks with magnetically recorded servo-information;
- and a distribution of laser textured pits forming a plurality of servo-marks capable of being sensed to enable accurate reading of the servo-information and positioning of a read/write head in the data zone, the method comprising:
- electrically or mechanically detecting one or more of the laser textured servo-marks on the surface of the magnetic recording medium;
- reading the magnetically recorded servo-information in a data track;
- and
- moving the read/write head to a particular position in the data zone in response to reading the servo-information, wherein the distribution of pits comprises an arcuate series of pits.
Dependencies are inferred from the claim text.