I once had a mom with the two usual ide controller slots, but also had two of the ultra-blue slots, so could have 7 hd plus cd...but why need it now, with 120 gig hds and more.
If u have a bunch of hds u want to to put on one hd, then use FX and copy what u want...or copy whole hd to hd with Ghost. Or put one hd as slave to your big hd, wplit the screen, drag whatever folders u want from slave to master.
If u use fx, u need the floppy program, and special belken cable.