1. Not sure! Sorry.
2. See #1.
3. Open a terminal and run '#lspci -s -vv 2.04' (might be 2:04)
4. The 256 drive will be /dev/hdx, where x is some letter. It starts at a, and the progresses. Just poke around. If you get something like 'mount: /dev/hdx is not a valid block device', then that drive doesn't exist, and you should go back to the last one.