Well I just bought 2 Seagate 250GB HDDs Ultra ATA/100. My PC already had 2 other HDDs: 80 GB Seagate ST380013A and 80 GB WD WD800JB. I also bought Ultra ATA/133 controller card in order to add those other 2 new HDDs. When I boot up my XP, and go to my computer it doesn't show that those two new HDDs are there. Should I put jumper on pins in a back of HDD, because right now, there are no jumpers there, set as slaves on both of them? Can some please help me out? Thank you in advance. PS. I have Asus P4S800 motherboard and I'm running XP Pro SP2 if that helps. Once again, thank you in advance.