Propagation self servowrite using self-written spiral...

Details Propagation self servowrite using self-written spiral... Propagation self servowrite using self-written spiral...

2007-08-14

2007-08-14

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

11081340

ABSTRACT:
The operation of propagation self servowrite can be improved by using spirals written upon the disk. The spirals can be used to reduce the DC drift of the propagation of the self servowrite. The writing of the spirals can be improved by using the back EMF signal for the VCM to control the velocity of the actuator during the writing of the spirals to produce a more consistent spiral shape. Additionally, back EMF crossings of the spindle can be used to space the spirals evenly about the disk.

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