{HEAD ~ The docking bay} replaces {TAIL ~ either a hard disk drive} or a floppy disk drive in the personal computer 
{ HEAD ~ The docking bay } replaces { TAIL ~ either a hard disk drive } or a floppy disk drive in the personal computer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH