3. Additional advice for the later OS installation:•Make sure, that the CD/DVD device where you want to boot off your nLited CD, is not connected to any of the Intel S-ATA ports. Optical drives generally have problems with the enabled AHCI or RAID mode. Solution: Connect the optical drive to another available S-ATA port (for example with JMicron Controller), which is running in IDE mode. Alternatively you may replace your S-ATA CD/DVD device by an IDE connected one. Hello, thanks so much for being so helpful! I am trying to build a new system, an thought I could just follow your guide, until I got to the above quote...please help: I have: Asus P8P67 LE mobo this has: (Intel) 4 x SATA 3Gb/s ports 2 x SATA 6Gb/s ports (Marvell) 1 x SATA 6Gb/s port (specifies cannot be used for optical drive) 1 x UltraDMA 133/100/66 I have: SATA optical drive SATA HDD Server 2003 (ready to nLite/slipstream SP2 and AHCI drivers ver. 10.8.0.1003) I thought I was all set to install until I got to your quote above...now what? Is it possible to enable AHCI on only some of the ports, or is it all or nothing? Please don't tell me I bought the SATA optical drive for nothing...?