> P.S. You need at least UltraDMA mode 2 to get CRC protection (=> you do > not want to turn off DMA without a really good reason). Lower modes > (PIO or multiword DMA) do not have CRC protection. afaik, there do exist UDMA modes 0 and 1 - they're not commonly used, but they're valid, and should definitely have the same benefit of CRC.