Disk drive with calibration bursts that are recorded on a spiral

Details Disk drive with calibration bursts that are recorded on a spiral Disk drive with calibration bursts that are recorded on a spiral

1998-04-30

2000-07-18

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 48, 360 57, 360 7708, G11B 2102

Patent

active

060915641

ABSTRACT:
A disk drive with a disk having a servo pattern including a special "calibration track" wherein a plurality of calibration burst pairs are recorded on a spiral centerline to define null points that are radially shifted from a burst pair centerline by precise, predefined or subsequently measured, fractional track amounts to collectively provide accurate information about servo signal values generated as a function of real displacement. The calibration burst pairs beneficially allow for calibrating the PES signal after the drive is removed from the servowriter during a manufacturing phase called Intelligent Burn-In. The calibration bursts are recorded on a spiral to reduce the recording time and are preferably written in data regions so that they are disposable and may be selectively written over with data to maximize storage space. Some or all of the calibration burst pairs may be retained for a subsequent recalibration.

REFERENCES:
patent: 5526211 (1996-06-01), Hetzler
patent: 5553086 (1996-09-01), Sompel et al.
patent: 5784219 (1998-07-01), Genheimer
patent: 5870242 (1999-02-01), Abe et al.
patent: 5986847 (1999-11-01), Le et al.

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