When the switching means disconnect {HEAD ~ the motor} from the electrical power source, {TAIL ~ the disks} coast to a stop 
When the switching means disconnect { HEAD ~ the motor } from the electrical power source , { TAIL ~ the disks } coast to a stop
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH