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US 8,947,802 B2Granted
Methods and systems for magnetic media servo writing
AssigneeImation Corp.
InventorsDouglas W. Johnson, Roni J. Dornfeld, Stephen J. Rothermel
Life of this patent
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Abstract
A method comprises generating first and second magnetic field components in a magnetic medium, the second magnetic field component substantially opposite the first. A pattern is written onto the magnetic medium, and a signal is generated by reading the pattern. The magnitude of the second magnetic field component is controlled based on an asymmetry of the signal.
Claims20
A method comprising:
- generating a first magnetic field component in a recording layer of a magnetic tape medium;
- generating a second magnetic field component in the recording layer of the magnetic tape medium, the second magnetic field component oriented substantially opposite the first magnetic field component;
- writing a servo pattern onto the recording layer of the magnetic tape medium;
- generating a servo signal by reading the servo pattern from the recording layer of the magnetic tape medium;
- determining an asymmetry in the servo signal;
- and
- controlling a magnitude of the second magnetic field component based on the asymmetry.
4 more elements
A magnetic tape medium system comprising:
- first and second magnetic heads positioned along the magnetic tape medium, the first and second magnetic heads configured to generate first and second substantially opposite magnetic field components in a recording layer of the magnetic tape medium;
- a write head positioned along the magnetic tape medium, the write head configured to write a servo pattern onto the recording layer of the magnetic tape medium;
- a read head positioned along the magnetic tape medium, the read head configured to generate a servo signal by reading the servo pattern;
- and
- a controller connected to the read head and the second magnetic head, the controller configured to control a magnitude of the second magnetic field component based on an asymmetry of the servo signal.
2 more elements
A system comprising:
- first and second magnetic heads positioned along a magnetic tape medium, the first and second magnetic heads configured to generate first and second substantially opposite magnetic field components in a recording layer of the magnetic tape medium;
- a write head positioned along the magnetic tape medium, the write head configured to write a servo pattern onto the recording layer of the magnetic tape medium;
- a read head positioned along the magnetic tape medium, the read head configured to generate a servo signal by reading the servo pattern;
- and
- a controller connected to the read head and the second magnetic head, the controller configured to control a magnitude of the second magnetic field component based on an asymmetry of the servo signal.
2 more elements
Dependencies are inferred from the claim text.