We still have some some issues with SATA/AHCI on NVIDIA chipsets.  If
you have a machine, could you send me the following information:

* dmesg
* output of 'pcidump -vxx'
* BIOS setting (IDE/SATA/AHCI/RAID) if your BIOS provides that opportunity
* short description of any changes (BIOS settings, kernel config) you
  need to make to get things working.

If your machine has the possibility to change the mode of the disk
controller in the BIOS, and you're willing to spend some time, please
try them all and and send me a report for all of these.  Note that
this may cause your disk to change from wd* to sd* or the other way
around.  So you may need to (temporarily) change your /etc/fstab.

Thanks,

Mark