QNX 4.2 harddisk partition problem

I am installing QNX 4.2 into a computer. I define clearly about my harddisk

I install with the following instructions.

" install -p “-c 16,1646,63” = 850Mb

When I detect the harddisk, but it show…
" is it 42 heads, 306 cylinders, and 17 sectors?" = 10Mb

In this mode, should I accept it?

Or can I do fdisk before install?

I know it is because the cylinders> 1024, but I follow the instruction to
partition small part (less than 10 mb) for bootable, another for main use.
Anyway, I just can’t do it. Would anyone help me?

Bunny, Shih Bun, Yu