Invention Grant
- Patent Title: Disk drive and calibration method therefor
- Patent Title (中): 磁盘驱动器及其校准方法
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Application No.: US11985367Application Date: 2007-11-14
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Publication No.: US07800855B2Publication Date: 2010-09-21
- Inventor: Kenichi Kuramoto , Shinya Sakamoto , Nobuhiko Wasa , Sayaka Nojiri , Hidefumi Tominaga
- Applicant: Kenichi Kuramoto , Shinya Sakamoto , Nobuhiko Wasa , Sayaka Nojiri , Hidefumi Tominaga
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Priority: JP2006-309745 20061115
- Main IPC: G11B5/55
- IPC: G11B5/55 ; G11B21/12
Abstract:
Embodiments of the present invention help to prevent destabilization in voice coil motor (VCM) velocity control. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) calibrates a correction operational coefficient of a detected back electromotive force (EMF) voltage before unloading. The calibration is carried out in a state that an actuator is pivoting. The HDC/MPU calibrates the correction coefficient according to a motion equation of the actuator using VCM current applied to a VCM and a detected value of a back EMF voltage detection circuit.
Public/Granted literature
- US20080123216A1 Disk drive and calibration method therefor Public/Granted day:2008-05-29
Information query
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