Invention Grant
US07804660B2 Method for unloading head without calibration in hard disk drives
失效
在硬盘驱动器上卸载头而不进行校准的方法
- Patent Title: Method for unloading head without calibration in hard disk drives
- Patent Title (中): 在硬盘驱动器上卸载头而不进行校准的方法
-
Application No.: US12242350Application Date: 2008-09-30
-
Publication No.: US07804660B2Publication Date: 2010-09-28
- Inventor: Jian Qin Gong , Chang Ik Kang
- Applicant: Jian Qin Gong , Chang Ik Kang
- Applicant Address: KR Suwon
- Assignee: Samsung Electronics Co., Ltd.
- Current Assignee: Samsung Electronics Co., Ltd.
- Current Assignee Address: KR Suwon
- Agency: Irell & Manella LLP
- Agent Ben J. Yorks
- Main IPC: G11B21/02
- IPC: G11B21/02
Abstract:
A hard disk drive with a voice coil motor coupled to a head. The disk drive includes a circuit that provides a drive current with a sinusoidal waveform to the voice coil motor during an unload routine. The back emf of the voice coil motor can be determined during a sample period when the current is essentially zero. There is no need to perform a resistance calibration. This reduces the time needed to unload the head.
Public/Granted literature
- US20100079909A1 METHOD FOR UNLOADING HEAD WITHOUT CALIBRATION IN HARD DISK DRIVES Public/Granted day:2010-04-01
Information query
