I have a FC San with 80 disk. The controller head quit working and instead of replacing the head I have created a software Raid 5. This all works. The problem is windows reports that disk 70 is bad and so I would like to replace it only I have no way of knowing which one it is? What am I missing on this? since this is 5 enclosures I can't possibly know which disk that windows calls "Disk 70"