Compensation for variable servo track width
AssigneeIomega Corporation
InventorsScott E. Chase, Daniel D. Rochat, Lawrence Moon, Gregory M. Allen
Life of this patent
Estimating the term…
Abstract
A track map of a disk drive is generated to compensate for various conditions. A track map is a stored measurement of every “half” servo track width on a disk. Every servo half track width is measured in the factory on a disk and then the data is stored on the disk for use during drive operations. When an individual track is accessed, the appropriate servo half track width data is pulled from memory and is used to adjust a scale factor for that local half track width. The track map may be used to compensate for various conditions including varying servo track width, microjog distance, and data track spacing.
Claims20
A method for compensating for variable servo track width in an information storage disk comprising:
- creating a track map of the storage disk,
- wherein the track map includes a stored determination of an average width of every half servo track on the information storage disk;
- adjusting a scale factor, which is a BSF1 (“Burst Scale Factor 1”), for a servo track width based on the track map;
- and
- calculating a multiplicative scale factor BSF2 (“Burst Scale Factor 2”) such that the servo track width is represented by 4096 bits.
An information storage system comprising:
- information storage media having a plurality of servo tracks;
- and
- a track map defining a location for each of the plurality of servo tracks,
- wherein the track map is stored on the information storage media,
- wherein the track map includes a stored determination of an average width of every half servo track of the information storage media, and
- wherein a scale factor, which is a BSF1 (“Burst Scale Factor 1”), is adjusted for a servo track width based on the track map and a multiplicative scale factor BSF2 (“Burst Scale Factor 2”) is calculated such that the servo track width is represented by 4096 bits.
A method of creating a track map for a data storage system comprising:
- measuring the half servo track widths on an information storage media,
- wherein the information storage media includes a plurality of servo tracks, and
- wherein a half servo track width is determined for every half servo track;
- storing the half servo track widths in a track map on the information storage media;
- adjusting a scale factor, which is a BSF1 (“Burst Scale Factor 1”), for a servo track width based on the track map;
- and
- calculating a multiplicative scale factor BSF2 (“Burst Scale Factor 2”) such that the servo track width is represented by 4096 bits.
Dependencies are inferred from the claim text.