>So I'm wondering what config files I need to tweak, to help the >already installed system use the "new" ahci controller? Previously, >it appears to have been using the piix module to access the drive with >the root fs on it. So, you need modprobe.conf to reflect this as well as a new initrd. On a similar system I have from Asus my modprobe.conf looks like this: alias scsi_hostadapter ata_piix alias scsi_hostadapter1 ahci I assume the ata_piix is still required for the jmicron ide controller. After editing this, run mkinitrd which will look there and then load the required modules. HTH, jlc