In general, the IDE slave drive is hdb. So if you made it all one partition, you would mount hdb1. Now if it were an external USB drive or a SATA drive, I think it's usually sdb or something like that...
Baggen's post should give you an output of something like:
NTFS FS on /dev/hda1
EXT3 FS on /dev/hda2
EXT3 FS on /dev/hdb1
Then type fdisk -l /dev/hdb1 or such for the drive without NTFS on it.