I just opened my disk Defragmenter for the first time. I have 4 internal drives, 1 SSD C drive (238 GB), and 3 storage drives (each is 3 TB). In disk defrag, the C drive says "never run" next to it, and 2 of the 3 storage drives have specific dates next to them, and "0% fragmented". But one of the other storage drives has "never run" next to it. Why would that be? Why would Win 7 single out this drive to not ever defrag?