Method for preventing head collision when detection of servo syn

Details Method for preventing head collision when detection of servo syn Method for preventing head collision when detection of servo syn

1998-01-28

2000-07-04

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5596

Patent

active

060847417

ABSTRACT:
A method for preventing a head from colliding with a peripheral mechanical unit when the detection of servo synchronizing signals of a constant number fails. The method includes the steps of: checking whether a servo synchronizing signal is detected; if the servo synchronizing signal is not detected, checking whether the number of undetected servo synchronizing signals exceeds a set value during track search; if the number of undetected servo synchronizing signals exceeds the set value, setting a servo synchronizing signal detection errorbit and servo-controlling the head by using a position estimating value calculated by an estimator algorithm; and if the head is changed to a settling mode while the head is servo-controlled and the servo synchronizing signal detection error bit is set, decelerating and parking the head.

REFERENCES:
patent: 5109307 (1992-04-01), Sidman
patent: 5295026 (1994-03-01), Chishima
patent: 5355260 (1994-10-01), Mikada
patent: 5371724 (1994-12-01), Uno
patent: 5963393 (1999-10-01), Rowan et al.

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