Hello!
First you have to know witch hdd/partition you want to mount, for this use :
su -
fdisk -l
Then you have to create a directory where to mount the preferred partition:
mkdir /mnt/winpartition
To mount for example the first partition of the second hdd use:
mount /dev/hdb1 /mnt/winpartition
If you want to have them mounted on each system-start, you have to edit your /etc/fstab file.
here 's an example.
PS: don't forget to use
exit to get back as normal user
Cheers, Boby