{HEAD ~ The storage device} 1, wherein the first expansion connector and {TAIL ~ the second expansion drive connector} are located in a left most column of the plurality of columns of the matrix configuration 
wherein
{ HEAD ~ The storage device } 1 , wherein the first expansion connector and { TAIL ~ the second expansion drive connector } are located in a left most column of the plurality of columns of the matrix configuration
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH