to read {HEAD ~ the set values} and image data out of first address space of {TAIL ~ said storage unit} using direct memory access 
to read { HEAD ~ the set values } and image data out of first address space of { TAIL ~ said storage unit } using direct memory access
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH