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