Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-11-07
2006-11-07
Sniezek, Andrew L. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078040
Reexamination Certificate
active
07133242
ABSTRACT:
Embodiments of the invention provide a magnetic disk drive and magnetic disk drive control method for unloading a head safely with a simple configuration when a positioning control signal cannot be detected due, for instance, to a seek error. In one embodiment, when a head cannot detect servo information prerecorded on a disk, a positioning control section resets and starts a time counting section, and switches to an unloading control section for causing the unloading control section to output a position control signal to a VCM driver. The time counting section counts tacho-pulses generated by a motor driver, and outputs time information. The unloading control section receives the time information from the time counting section. In accordance with the received time information, the unloading control section computes the position control signal that the positioning control section outputs to the VCM driver. In this instance, the unloading control section controls the VCM driver to provide such an electrical current profile that the drive current to be supplied to a VCM is small at an initial stage and large at a later stage.
REFERENCES:
patent: 6643088 (2003-11-01), Kawachi
patent: 6920007 (2005-07-01), Tominaga et al.
patent: 2004/0080858 (2004-04-01), Suzuki
patent: 2001-143228 (2001-05-01), None
Beppu Osamu
Fujii Yoshikatsu
Matsushita Shinji
Nishida Sadahiro
Tominaga Hidefumi
Duncan Patrick
Hitachi Global Storage Technologies - Netherlands B.V.
Sniezek Andrew L.
LandOfFree
Magnetic disk drive and magnetic disk drive control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic disk drive and magnetic disk drive control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic disk drive and magnetic disk drive control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3652317