SilentGlow
There are only 4 master SATA drives possible on this board (the 3th&4th connector acts as slave). So if you use lower ports the middle one is slave no matter what you do.
is correct i don't understand your problem. I am using all 6 sata slots. 1~4 use my hitachi sata2 x80gb. 5 & 6 hold my data drives.

just connarect any drives u wish to boot to to sta 1&2 or 4&6.