{HEAD ~ The backboard} has all or {TAIL ~ some} of the drive connectors on a front face thereof, arranged in a matrix configuration having a plurality of rows and a plurality of columns 
has
{ HEAD ~ The backboard } has all or { TAIL ~ some } of the drive connectors on a front face thereof , arranged in a matrix configuration having a plurality of rows and a plurality of columns
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH