Why doesn't the installer see all of my hard drives?

I'm trying to setup a dual boot system with Windows Vista 64 (already installed) and Ubuntu 10.10. I added a new drive which is identical to the one Vista is installed on. When I boot into the LiveCD I can see and mount the second drive and edit it in Gparted. However, when I use the installer it will only bring up the drive that already has Vista installed.

I've tried everything I know. I'm not sure if its a BIOS setting or something else I've missed.

I've also tried both the desktop and alternate amd64 installs with the same result.

Try to boot a live session and start a terminal session (or to switch to the console with CTRL-ALT-F1) and issue:

sudo os-prober

You'll probably see a probing error which could be the reason why your drive is not taken in consideration. It's quite likely that your second drive has leftovers of a RAID configuration, in this case it's sufficient to do:

sudo dmraid -rE

(-r = raid, -E remove metadata) and confirm the operation. Start the installer and you should see it.

sudo apt-get remove dmraid

This seems to have fixed the problem for me. At least now I'm not getting the empty drive box. It's asking me to choose from 3 options.