Wrng thread I guess, but since you started on AHCI - please help me out.
I got a sata 1,5, and a sata 3.0 drives.
Sata is configured as IDE in bios. HDtune reports that max capability for each drive is UDMA6 (ata-133), but they operate at UDMA5 (ata-100 respectively), should I choose the option "configure sata as ahci" instead?
Board is: ASUS P5B