[igalan]

Yes, this works in all the motherboards that I've tested. With S-ATA there is no longer master-slave, all devices are "masters" and connect directly to the motherboard. Additional P-ATA diveces connect as master for the first one, and slave for the next one for each channel regardless of S-ATA devices (as in any non S-ATA board).

So you can boot from a S-ATA drive, while a master P-ATA drive and a slave P-ATA DVD burner (for instance) are connected at the same time. However this set up may requiere some fiddling with the BIOS so the S-ATA drive is the first to boot, and then some fiddling with Windows XP so it installs in the S-ATA drive.