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