Thanks Slayer - you let me see there are software issues. The hard drive is in a caddy--pata connectors throughout but right now it is on an "add-on" ide controller and I can well see that card might not be seen in Vista. I thought about moving the caddy around, but the room/layout in my case/desk is a bit restricted. I'll check on drivers when I confirm who made my card. Both XP and Vista are 32 bit. Thinking some more, Vista DOES recognize hard drives that are connected on the same controller directly on the data cable. That lessens software issues down to zero doesn't it?? Even in XP, the Slave position hard drive is seen in XP but the bios can't boot from it.--A potential for 8 hard drives but can only boot from 7 of them, seems functional to me. But Vista doesn't see the caddy drive but does see two other hard drives off the same controller. ((Again, the caddy is alone on the cable in the Master Position with jumper set to Master-No Slave Position))
Somewhat similar to the above is that my Voodoo 3 video card has dual monitors running in XP but Again Vista only sees one of the monitors. Makes sense to me it "should" see both or neither???? but thats not the way its working. I can accept on faith that its all about compatibility but like above, if it sees "half" the card, why not the whole thing??? Is software really that specific??? /// Bobbo.