I had the same problem, even though the bios cannot support it,there may be a utility that came with the hard drive that will make it compatible. ie I bought a western digital 7200rpm ATA 100 and had to configure the drive to work at ATA 66 so my bios would control it. The utility was bundled software that came with the hardrive. Note..sometimes your better off to use the ide cables that came with the mobo. The ATA 100 cable would not work on my mobo but the original cable that came with the board did. Good Luck!