Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-05-30
2006-05-30
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07054091
ABSTRACT:
A retract circuit (40) for retracting a data transducer carriage assembly (17) of a mass data storage device (10) to a retracted position has a digital state machine (55) that is user programmable to operate in a selected retract mode. An analog control circuit (44) is provided for receiving control signals from the digital state machine (55) for providing analog retract signals to move the data transducer carriage assembly (70). The digital state machine (55) is user programmable to operate in constant voltage, velocity detect, float and pulse, and crash stop detect modes. Preferably, the digital state machine (55) is programmed to detect a velocity of the data transducer carriage assembly (17). The digital state machine (55) also is preferably programmed to detect an error velocity of the data transducer carriage assembly (17) from a difference of a measured voltage across the data transducer driver (22) from a predetermined voltage.
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Brady W. James
Hudspeth David
Slavitt Mitchell
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
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