@Acill
but I was sure I could make it one large drive if I wanted to
Please don't want.
Remember that on startup all code to handle harddisks is being read from ROM, including trackdisk.device. This means that on the startup you have to use old one, that has 4GB drive limit. On OS startup this trackdisk.device is removed from the system and replaced with new trackdisk.device read from disk. From this time you have no 4GB limit.
BUT
FOR THIS REASON
PLEASE REMEMBER ABOUT 4GB LIMIT FOR YOR STARTUP PARTITION!
This involves both - size of the partition and the space it allocates on disk - ALL OF THE PARTINION MUST BE INSIDE LOWEST 4GB SPACE OF DISK.
Cheers