There are two "DMA" links in my sig. Follow the steps in #1...pretty quick and straightforward.
If no luck, you're on to #2 (this is pretty likely since resetting didn't help). This can get a little complicated, but still not too bad. Assuming you're running xp? Basically, as xp encounters CRC errors, your burner's transfer mode (rate of data transfer) is sequentially decreased. Once you exceed 6 CRC errors, you're stuck in PIO. Just an FYI, your burner(s) probably should be in Ultra DMA2, whereas your hdd(s) are probably UDMA 5 or 6. The second DMA link gives a pretty good explanation of what's going on here.
Hope this helps, let us know...