It looks like there are issues with the controller supporting atapi devices, have a read on this thread
GA-EP45-DS5 G-SATA Problem! Please Help!
As for using sata devices on this controller, myself and other users have been having issues getting any kind of raid setup configured on the SATA2 after BIOS F5, it seems they disabled the RAID controller and only devices on GS0-GS2 can be used as normal sata drives.
Having a look at the website it seems they have quietly changed the official specs on the website to say it now only supports RAID 1, I am not sure if any other options will ever be enabled again?
GIGABYTE - Product - Motherboard - Specification - GA-EP45-DS5 (rev. 1.0)
cheers