I have given up on the origional plan. Now set up with <500mb partition for OS3.9, then split the drive up into 1.8GB partitions.
Seem OK but Sysinfo reports it is slower than the old hard disk, however I could swear it's a bit quicker on loading up.
I have a seperate question now, but I will start a new thread for that if I can't find the answer here.