I've been handed a Supermicro system that is using the Intel® H6300ESB Serial ATA Controller (Supermicro P4SCI motherboard). When I install CentOS5, everything seems to work OK, but it has absolutely horrid disk performance. Upon further inspection, it seems that the SATA disks are being treated as legacy IDE devices using PIO. Gah.... Has anyone else had this problem? I recall having similar problems last year sometime with some Supermicro systems, but I can't seem to remember how I fixed it. :-) Any suggestions would be much appreciated. Best,