Well, don't know how to really describe it so I'll give my best:
I have a USB drive (2GB) and I use it pretty much all the time. I have to store my portable programs data on it as well as a backup of one big file. The problem is that the big file has to be deleted and re-copied every week, and the small files get fragmented (especially if I add a new portable program), bug Defraggler, for some odd reason, refuses to sort out the aparently empty folders in the USB drive, as shown in these screenshots
Am I doing something wrong or is this a software bug? (I tried: seperate file defragmentation, normal defragmentation, free space defragmentation)