Defraggler may be accurate on the number of fragments on the drive, but it seems to display a very misleading percentage.
Drives with lots of files are especially vulnerable. I am guessing that this happens because even if there are say, only 30 fragmented files on some systems, that though fragmentation is low, it still has to move a lot of files to consolidate files + free space. The average user does not know that it takes time for say, 30 GB of non-fragmented files to be moved along with the fragmented files, since it just displays, hey, you have 30 fragments!
Great! Should be done in no time!
Perhaps they should include 2 percent bars? Time to completion along with percent fragmented so the user can get a better idea of what is going on?
I love defraggler, but I do think that the users do need a better way to tell why progress is taking so long when there are so few fragments sometimes!