If you see only 8GB, you have done something wrong when connecting the drive. Such large drives usualy have a jumper that limits the capacity to 8GB for old BIOSes. You have to remove this jumper.
The 3.1 HDToolbox should be able to partition the drive. But it will show some strange numbers for the size (e.g. negative). Better you use the 3.9 HDToolbox or HDInstTools.
Additionaly you have to use the direct-scsi version of PFS (PFS2ds or PFS3ds). Or you need an additional patch for the IDE driver. This could be IDEfix or OS3.9. In this case, the boot partition must reside within the first 4GB of the drive.
Bye,
Thomas
