{TAIL ~ A hard disk drive} is placed within {HEAD ~ a cartridge} which includes a second printed circuit board 
{ TAIL ~ A hard disk drive } is placed within { HEAD ~ a cartridge } which includes a second printed circuit board
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH