The backboard has {HEAD ~ all} or 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 
The backboard has { HEAD ~ all } or 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 HEAD HEAD HEAD HEAD HEAD OTH OTH 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