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On P4P800 dlx mobo I want to connect dvd-rom on third IDE chanel
(primary raid connector).
Why?
?Cause I have on 1. IDE chanel my HD drive as master and on 2. IDE
chanel I have CDRW Plextor as master and DVDRW Pioneer as slave.
AFAIK it not god to have on same IDE chanel HD drive and CDROM so I want
to use third IDE chanel.
Problem is that mobo doesnt detect device on third IDE connector.
RAID controler is disabled in BIOS.
Any suggestions?

The third IDE channel is the SATA channel not the VIA RAID controller.
There are some PATA to SATA adapters out there. Get one and use it on
your HD then use the remaining IDE channels to connect your CD and DVD.