Hey man, why are you running your drives through an IDE card? Did your motherboard's ata controller go out? Oh well, I suppose it doesn't matter. So, you did check to make sure that both drives have all of the cords plugged in completely, right? Did you turn the computer off to change or upgrade a part, or were you just rebooting? And if you changed something, what were you changing? And lastly, what IDE card are you using? Alot of them have issues, but they all depend on the card. I think you're going to need to give us the whole story before we're gonna be able to help you figure this one out.