I'm surprised nobody likes ReOrg because I've used it alot and has never failed me. In my A600 I have a HD that makes alot of hacking noise when swapping tracks. After a reorg loading files won't make that hacky noise coz all tracks are after one another. Hence I used it alot.
But with the multitasking environment you're loading more files at once and you still hear the head swapping tracks. But I'm surprised that my computer at work always gets messed up even if I never delete files. You would expect the files there to stay in place but they get fragmented too ?
Anyway... I've formatted another partition and copyd all files to that. This works too! :-D