Actually neither. It would be Upper left 11              8             5                2 10              7             4               1 9                6             3                0 Hope this helps.                                                                                                                                                                                                                                                                   
Hello- What is the order of the drive numbering on a C2100?  Does it go from left to right or top down? In other words, which drive is drive 1, which is drive 2, etc.  The server is remote so i can't test.  Thanks!
C2100 Drive Order