ATA 100 was not out yet when I bought my Maxtor ultra/66 but my board manual says that it is backward compatible. Asus tech was worthless when I called them. They said I had to format and reinstall my os on the 100 controller. (using win ME) I did this and my drive is still not recognized. I have the bios 1004c that came with the board and I have read the manual back to front so many times all the pages are WARPED!. Please help me!