acill:no sorry u must reformat to use this, but its an easy way and u wont ever get DISK NOT VALIDATED etc anymore + your hd speed will most likely fly with sfs compared to your ffs.
btw SFS is infact included on your os3.9 cd in contribution..
anyway i recomend you to use 1.2xx atleast ..
if u need help, you can email me and discuss it further if u like..
cheers