Magnetic servo of a recording head
AssigneeQuantum Corporation
InventorsRobert Johnson, George Bellesis
Life of this patent
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Abstract
A method of aligning a magnetic read/write head to data tracks on a magnetic surface of a digital linear tape. The method includes writing a signal over a track of optical servo marks located on the magnetic surface of the tape with a servo channel writer, generating a position error signal from read back signals obtained from a servo channel reader and positioning the magnetic read/write head in accordance with the position error signal.
Claims19
A method of aligning a magnetic read/write head to a plurality of data tracks on a magnetic surface of a digital linear tape comprising:
- writing a signal over a track of optical servo marks located on the magnetic surface of the tape with a servo channel writer;
- generating a position error signal from read back signals obtained from a servo channel reader, the servo channel reader including a first read head and a second read head for reading the signal written over the track of optical servo marks;
- and
- positioning the magnetic read/write head in accordance with the position error signal,
- wherein the read back signals include a first signal from the first read head and a second signal from the second read head, and
- the position error signal includes a difference between the first signal and the second signal, wherein an absolute value of the difference is a magnitude of an offset and a sign of the difference is a direction of the offset.
A magnetic recording head servo system comprises:
- a plurality of recording channels;
- at least one magnetic servo channel, the magnetic servo channel generating servo signals from a track of optical servo marks;
- a servo processing system connected to the magnetic servo channel for processing the servo signals, wherein the servo processing system comprises:
- means for determining a difference between amplitudes detected by heads,
- means for converting the difference into a linear position instruction, and
- means for sending the linear position instruction to the motor;
- and
- a motor connected and responsive to servo instructions received from the servo processing system, the motor controlling a position of the recording head servo system relative the position of the track of optical servo marks.
A method of aligning a magnetic read/write head to a digital linear tape comprising:
- reading a signal disposed over a track of optical servo marks located on the magnetic surface of the tape with a servo channel reader, the servo channel reader including two laterally displaced read heads for reading the signal;
- generating a position error signal from read back signals obtained from the servo channel reader;
- and
- positioning the magnetic read/write head in accordance with the position error signal.
Dependencies are inferred from the claim text.