I have an old IDE hard drive from my old computer. My new computer runs vista 64 and uses SATA hard disks. My motherboard has both sata and IDE plugs. When I plug in the IDE hard drive, I can see it as a booting option in my bios, but can't see it in vista.
Does the bios detect the drive and tell you what size the drive is? Just because its listed in the boot order doesn't mean its detected or installed correctly. You have the drive set correctly? Most drives have a jumper setting for single when they are the only drive int he system. If its an ultra100/133 drive you need the 80 wire ide cable with the drive connected to the black connector and CS set on the jumper. cs = cable select