Actually, the max partition size on a standard non-patched Amiga is 2GB, and all partitions must be within the first 4GB of the harddisk. That being said, a 500MB Workbench partition should be enough.
In order to use the full capacity of your CF card, you will need the following:
1. A filesystem which supports large harddisks, this can be either PFS, SFS or a newer FFS.
2. A newer version of scsi.device that patches the system on bootup by using LoadModule.
3. NSDPatch for helping the Workbench to "see" all partitions beyond the 4GB border.
If you plan on installing ClassicWB to the harddisk, all required files will be included. But you must manually copy a correct version of scsi.device from the MyFiles/LargeHD drawer.
You can follow the instructions in fitzsteve's video if you want to setup your CF card by using WinUAE, but if you prefer to do this on your A1200 instead, you can try one of my ready-made Amiga911 boot disks, this one should be suitable for you:
https://app.box.com/s/s4d1tgoihush5gjnsghgThe disk contains almost everything needed for setting up a large harddisk on the Amiga, the only thing you need to add is a suitable version of the scsi.device file. You can find it in the LargeHD pack that I grabbed from ClassicWB:
https://app.box.com/s/kiu7zx4gdzyht1so5udzFor setting up your CF card, I will recommend that you use HDInstTools instead of the AmigaOS 3.1 version of of HDToolBox, this is because it's such a pain trying to resize partitions of a large drive with the latter. The AmigaOS 3.9 HDToolBox is of course the best one though.
If you are interested in the Amiga911 disk, you can read more about it here:
http://amiga911maker.site11.com
