Simple:
1: Run the 'Create Custom Boot Disks' item from the Partition Magic startup button. This will give you 2 floppys.
2: Plug in the HDD
3: Boot-Up using the floppys you made, this will automatically take you in to Partition Magic.
4: In the P-Magic dialogue, select your second drive (which should be blank space), right click on the blank space and select 'Create'. Make sure you select Either Fat32 or NTFS, whichever is your flavor. And then hit the 'OK' button.
p.s. Partition Magic would probably allow you to do this all from XP, but I like to play safe!!
TOK