I have a Soyo LX chipset MB. I have never been able to keep the DMA box checked in device manager for the primary master drive, a Quantum 10G udma ata 66, 7200 drive. I assumed the MB didnt support it. However when I hooked up another harddrive on the secondary controller as a master, a WD 20G, DMA stays checked for this drive. I have checked thru the bios, but havent found anything that might seem to enable it on the primary. Any help appreciated. Edna Sloan Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://nospin.com/pc/pcbuild.html