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