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