So for those of us who aren't smart, how do you change the file system of a partition?
Generally... all you should have to do is install PFS3 on the system you're using and then select the partition you'd like to make a PFS3 partition and with the likes of HDToolbox set that partition to PFS3, save the changes to the disks RDB then do a quick format of the partition...
Remember of course to backup anything first from the partition that you want to keep...