When the switching means causes the motor to spin, {HEAD ~ the disks} free {TAIL ~ spin} around the motor shaft 
free
When the switching means causes the motor to spin , { HEAD ~ the disks } free { TAIL ~ spin } around the motor shaft
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH