DMA reverts to PIO

Driver not intended for this platform
Driver not intended...
The stuttering DVD drive or the lame hard disk
Das stotternde DVD-Laufwerk oder die gelähmte Festplatte
Quick solution

If you're not interested in the details, but just want to fix this problem as quickly as possible:

1. Click here.
2. Despite any warnings click on the [Open] or [Execute] buttons as required to execute the file resetdma.vbs. (If you fear that this web site could be malevolent, you can use the manual method instead, which is described below. Or you could download, save, and inspect the program with an editor like the Windows Notepad. It is a script text file.)
3. If the program found any ATA channel to reset, reboot your computer and test all drives.
4. If the problem is still not solved, set the offending channel to PIO manually, reboot your computer, set the channel back to DMA, and reboot again.
5. Please report your results here. Thanks!

Please note that this works only with the Windows drivers. If your device had its own manufacturer's drivers installed, this program cannot fix the problem and will not do anything to them. Instead it will report that no resettable DMA channels were found.
Note also that many CD and DVD drives only use UDMA-2, because their data rate is much lower than that of a hard disk. This is normal and no reason to worry.
If you are interested in the details, read on. The program tries to reenable DMA in the registry exactly as described below, for all suitable ATA channels. Windows then redetects the DMA status after the next reboot.