Calibration of writer offset using media dimensional stability
AssigneeInternational Business Machines Corporation
InventorsKevin B. Judd, Randy C. Inch, David L. Swanson
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Abstract
In one embodiment, a method includes writing, using a magnetic head, a set of parallel shingled tracks onto a magnetic recording tape using specified drive parameters, changing one of the specified drive parameters, reading a set of selected data tracks on the magnetic recording tape using the changed drive parameter, changing a lateral head position while reading the set of selected data tracks using the changed drive parameter, comparing track error rates observed during reading at the different lateral head positions, selecting a reader offset value based on the comparing, and performing a further action using the selected reader offset value.
Claims20
A method, the method comprising:
- writing, using a magnetic head, a set of parallel shingled tracks onto a magnetic recording tape using specified drive parameters;
- changing one of the specified drive parameters;
- reading a set of selected data tracks on the magnetic recording tape using the changed drive parameter;
- changing a lateral head position while reading the set of selected data tracks using the changed drive parameter;
- comparing track error rates observed during reading at the different lateral head positions;
- selecting a reader offset value based on the comparing;
- and
- performing a further action using the selected reader offset value.
An apparatus, comprising:
- a drive mechanism for passing a magnetic recording tape over a magnetic head;
- and
- a controller electrically coupled to the magnetic head, the controller being configured to:
- write, using the magnetic head, a set of parallel shingled tracks onto the magnetic recording tape using specified drive parameters;
- change one of the specified drive parameters;
- read a set of selected data tracks on the magnetic recording tape using the changed drive parameter;
- change a lateral head position while reading the set of selected data tracks using the changed drive parameter;
- compare track error rates observed during reading at the different lateral head positions;
- select a reader offset value based on the comparing;
- and
- perform a further action using the selected reader offset value.
A computer program product for calibrating a tape drive, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by the tape drive to cause the tape drive to:
- write, by the tape drive, a set of parallel shingled tracks onto a magnetic recording tape using specified drive parameters;
- change, by the tape drive, one of the specified drive parameters;
- read, by the tape drive, a set of selected data tracks on the magnetic recording tape using the changed drive parameter;
- change, by the tape drive, a lateral head position while reading the set of selected data tracks using the changed drive parameter;
- compare, by the tape drive, track error rates observed during reading at the different lateral head positions;
- select, by the tape drive, a reader offset value based on the comparing;
- and
- perform, by the tape drive, a further action using the selected reader offset value.
Dependencies are inferred from the claim text.