System and method for identifying track squeeze errors (TSEs) of a disk of a disk drive
AssigneeWestern Digital Technologies, Inc.
InventorsJie Yu, Guoxiao Guo
Life of this patent
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Abstract
A system and method for efficiently identifying track squeeze errors (TSEs) of a disk of a disk drive during a testing process for the disk drive is disclosed. The method includes reading servo bursts from a track of the disk, utilizing a modeled scan variable, and determining a gain comprising a ratio of a first matrix A and a second matrix B. TSEs associated with the SWEs of the servo bursts are determined for the track. The TSEs are determined as a product of the gain and a measured scan variable wherein the measured scan variable is calculated as being the difference between a measured scan value and an estimated nominal scan value.
Claims31
A method for identifying track squeeze errors (TSEs) of a disk of a disk drive during a testing process for the disk drive, the method comprising:
- reading servo bursts from a track of the disk, the disk including a plurality of tracks in which a substantial majority of the tracks include a plurality of servo bursts;
- utilizing a modeled scan variable;
- determining a gain, the gain comprising a ratio of a first matrix A and a second matrix B;
- and
- determining track squeeze errors (TSEs) associated with the servo written-in errors (SWEs) of the servo bursts for the track, the TSEs being determined as a product of the gain and a measured scan variable, the measured scan variable being calculated as a difference between a measured scan value and an estimated nominal scan value.
A system to identify track squeeze errors (TSEs) of a disk during a testing process, the system comprising:
- a disk including a plurality of tracks in which a substantial majority of the tracks include a plurality of servo bursts;
- a moveable head to read the servo bursts of the track;
- and
- a microprocessor for controlling operations including operations for determining track squeeze errors, the microprocessor under the control of a program to:
- read servo bursts from a track of the disk;
- utilize a modeled scan variable;
- determine a gain, the gain comprising a ratio of a first matrix A and a second matrix B;
- and
- determine track squeeze errors (TSEs) associated with the servo written-in errors (SWEs) of the servo bursts for the track, the TSEs being determined as a product of the gain and a measured scan variable, the measured scan variable being calculated as a difference between a measured scan value and an estimated nominal scan value.
Dependencies are inferred from the claim text.