In a method of controlling activation of a motor, based on a device number (unit address) set value A.sub.d which is determined exclusively for a disk device and a motor activation start time delay T.sub.d which is designated by a host control device, a motor activation start time T.sub.s which corresponds...http://www.google.com.tw/patents/US5488274?utm_source=gb-gplus-share專利 US5488274 - Method for controlling activation of disk drive motors
