I have two separate PCs - one with Windows XP Pro, and the other with Linux (Fedora Core 2). I simply mount a Windows share into the file system on Linux as follows:
sudo mount -o username=xxxx,password=xxxx,rw,uid=500 //192.168.0.2/[windows share] /home/phobbs/mounts/[mount point]
Note - you need to be root to do this, so either execute su -l first, or use sudo. In this case I don't specify the file system of the Windows disk (-t), I let mount detect it automatically.
If you are talking about two separate hard disks (or partitions) in the same PC, you might try this:
sudo mount -t [file-system] -o rw,uid=500,gid=500 /dev/hdc1 /home/phobbs/mounts/[mount point]
I suggest you read the man pages for mounting carefully - that is what I did and it is pretty straight forward.