I recently tried fitting a Samsung SATA DVD drive to my computer:
EPoX -4PDA5+ motherboard.
I already have an IDE CD Drive.
This is my first SATA device.
After I'd plugged it in, I booted my computer and I got the message 'DISK BOOT FAILURE. INSERT SYS.....'
I've tried different SATA ports and made sure my HDD was first in the boot priority.