Against my better judgment, I thought I might defrag my C: drive. M$ Defragger showed C drive (~640GB) at 0% fragmentation, but System Reserve (100MB, I guess it's a Win7 thing) at 7%. I had wanted to try Defraggler, so I downloaded it...it showed 6% fragmentation on the C drive, and it didn't recognize anything called System Reserve.
I then ran Defraggler (took about an hour). According to Defraggler, the C drive is now 25% fragmented! M$ Defragger is still reporting 0 and 7. What's going on? What should I do?