First create an OS3.9 emergency disk and boot from it. Use the HDToolbox from the emergency disk to install your hdd. Make sure the values for Heads, Sectors and Cylinders are large enough to make 20gig (check the total number of blocks to match those from the hdd manual). Then create a 1 or 2gig boot partition (must be below 4GB !) and one or more work partitions. Make sure under Add/Update the FastFileSystem version 44+ is installed.
Now reboot, format the partitions and install OS3.9 on the boot partition. Remove the emergency disk and reboot. Should be fine now.
Note that the boot partition always must be in the lower 4GB of the hdd. Also OS3.1 (including Kickstart 3.1 which is active after power-up) is not cappable to see beyond the first 4GB of any hdd. You have to boot from an OS3.9 partition (or floppy disk) first which loads the needed drivers to access the area above 4GB.
Bye,
Thomas
