[G4] G4 second drive "unsupported"

[Dale Hoffman]

>A friend just called me with a problem installing a second internal 
>hard drive in his G4 Sawtooth. He can't get it to initialize - Drive 
>Setup says it is "unsupported".
>
>He says the drive is an ATAPI 80GB Western Digital, but I've never 
>heard of an ATAPI fixed drive. I'm thinking he may have misplaced 
>the jumpers designating Master Slave, but I won't know until I visit 
>tomorrow. Any other ideas?
>

What about this "ATA" vs "ATAPI" issue? What's the difference and how 
might it affect the compatibility? The drive was bought at a local 
super computer store so I doubt there was any sales assistance 
involved.
DaleH