Self written read/write track servo parameter for spindle RRO co

Details Self written read/write track servo parameter for spindle RRO co Self written read/write track servo parameter for spindle RRO co

1996-10-23

2000-04-11

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, G11B 5596

Patent

active

060494409

ABSTRACT:
A method and apparatus is disclosed for compensating for spindle Repetitive Runout (RRO) by writing a servo parameter information field for both read and write tracks. Servo burst patterns may be written by servo writer during drive assembly and may be used to independently position write and read track servo parameter fields for writing in corrected positions. In track following mode, RRO may be calculated over several revolutions and average RRO calculated and stored. Position error values corresponding to RRO for every servo parameter and, thus, every sector, may also be stored in servo parameter gray code fields for both read and write tracks. Servo parameter information may be read back and decoded in a present sector for head position correction in subsequent sectors. For small offset, one servo parameter may be read to correct both read and write track center deviations. For large offsets between write and read element centers one servo parameter may not be read back during both read and write operations therefore two servo parameter fields may be used.

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