Hello Stephen > I am seeing a long pause on bootup of this Core2 system if I enable > AHCI in the BIOS. There is only one disc in this system, so when it > tries ata2 it is talking to an empty connector. If I turn off AHCI > then it seems to be okay. Looks like you have some kind of Asus Mobo... Is that correct ? It seems that you have the ata2 port that is connected not to a disk, but to another disk controller. Robert Ancock wrote me : "There is something connected, I believe what's actually there on this board on that port is the SiI4723 chip which is connected to two other SATA ports. For whatever reason it gets detected as a drive, and it also seems to be not responding until we do a few resets.. http://www.siliconimage.com/products/product.aspx?id=64" regarding my P5W DH Deluxe motherboard. To date, I still don't have any solution for that problem... but it seems you have some advance as you wrote : "If I turn off AHCI then it seems to be okay." I need to test this on my machine too... Regards, Paul - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html