QuarterbackTools has a working disk-optimizer, however it was even back then and now it seems to run partitions over 1GB forever. Also it has problems allready when it was released with 040`s copyback-mode; my 4000/040`s hd got scrambled few times in 1994 when I tested it.
I`m using FFS DC for my paritions; hd is 4GB (~3.7GB).