Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-07-05
2005-07-05
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06914745
ABSTRACT:
The hard disk drive comprises: a magnetic disk2having servo information stored; magnetic heads4seeking on the magnetic disk2and staying at a predetermined position to read or write data; a voice coil motor6moving the magnetic heads4to the predetermined position of the magnetic disk2;a position controller supplying a driving current to the voice coil motor6based on the servo information read by the magnetic heads4.The position controller includes: a CPU12outputting a speed control value based on the servo information; a DAC7and a VCM driver8converting the speed control value into the driving current; and a controller10limiting a driving speed of the voice coil motor6in a case that an output timing of the speed control value is shifted.
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Fukushima Yukio
Nakagawa Yuzo
Takeuchi Masayuki
Ueda Tetsuo
Feece Ronald B.
Hitachi Global Storage Technologies - Netherlands B.V.
Hudspeth David
Nunnelley Lewis L.
Tzeng Fred F.
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