with 3.1 roms, you can get the patches off the net to patch up your l:fastfilesystem to 45.1 which supports NewStyleDevices (64bit filesystem support) this works fine. or if you can get 45.9 off the OS3.5/9 CD this works too. just dont have your system partition got over the 4Gb boundery - just for safty's sake, and if you run fusion, don't have your mac partition go over the 4Gb boundery either, as it only has 32bit partiton internal addressing.
for example.
1Gb system partition, 2Gb Mac, 0.99Gb Temp partition, 25Gb Data, 25Gb Apps... thats just my config.
to update your fastfilesystem on the disks RDB, go into HD toolbox, and go advanced options "update/add filesystem" you should then be able to put your updated L:fastfilesystem in the disks RDB so it is available (and unbderstands your >4Gb partitions at boot time.
yay! large disks in workbench3.1! i will only use the 3.1 version of HDtoolbox as it is the most stable...