OA
Since your using SATA RAID your mobo should have at least four other IDE P-ATA channels available.
You should be able to set up a spare P-ATA hard disk as 1st IDE Master and if you've only got one optical drive I would set that as 2nd IDE Master. i.e. have two ide cables using each mobo ide connector. That will leave both slave channels free.
Prolly take some tweakin around in the bios to get this set-up, but straightforward enough to do.
Sadly the Datum has been infected by the deadly virus Fisheadius Commanderitis and now has serious "decor!"
p.s. wasnt Toxeth O'Grady a character from the Young Ones - TOG mentioned by Vvyan as the author of a reference book whilst Rik et al were on the train to University Challenge?
Read my profile!
TOG