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