For {TAIL ~ each mass storage device type} for which {HEAD ~ more than one mass storage device} exists, a device type menu is provided including menu items corresponding to each of the mass storage devices of the device type 
for exists
For { TAIL ~ each mass storage device type } for which { HEAD ~ more than one mass storage device } exists , a device type menu is provided including menu items corresponding to each of the mass storage devices of the device type
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH