In the first two SATA ports are my two 500 gig drives in RAID 0. In the third port is my DVD burner. The fourth port is empty. The fifth port has my 250 gig SATA drive and the sixth is empty. The fifth and sixth ports are in IDE emulation mode set from the BIOS because it won't install in any other mode. My only options are either IDE emulation or "As SATA mode" meaning it'd be the same as ports 1-4. RAID, that is. No card-readers, no USB drives, no floppy, no removable of any kind. As you probably know by now, AMD SB750 is the chipset this motherboard uses. Edit: Oh, and if it's any help... I've got a small partition of that non-RAID as C, the 2x500 RAID as D and the rest of the non-RAID as E.