I have one ATA HDD and one IDE HDD – Can I use both?

Yo!

I just built a rig from a motherboard with one IDE port and several ATAs. My one ATA HDD will be my master, but I also want to use my old IDE HDD for storage. How do I set this up on the IDE line that already contains my DVDROM? Should I set the DVD as master and the IDE HDD as slave?

Thanks! (Confused)

Ian