Track following servo actuator offset calibration for tape...

Details Track following servo actuator offset calibration for tape... Track following servo actuator offset calibration for tape...

2007-10-09

2007-10-09

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077120

Reexamination Certificate

active

11351774

ABSTRACT:
A magnetic tape drive, having a compound servo actuator, reduces the possibility of overshoots of servo elements when a tape cartridge is loaded, thereby reducing servo failures. The coarse motor is activated, then deactivated when the servo elements locate a servo pattern on the tape. After initialization of a DAC offset in the servo controller to 0, the position of the fine actuator is read. The fine actuator is enabled, with a DAC input of 0 and, after a short wait, the position is again read. The new DAC offset equals the initial DAC offset plus the difference between the two positions. If the difference is less than a predetermined threshold, the servo controller may obtain a lock on the servo signals and commence tracking. If the difference is not less, the process is repeated, with the DAC offset being adjusted each time, until the difference is less than a predetermined threshold.

REFERENCES:
patent: 7110212 (2006-09-01), Bui et al.

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