IDE DVD burner stuck in PIO mode.

Windows XP solutions series:  IDE DVD burner stuck in PIO mode.

My DVD burner stuck in PIO mode right after I tried to read a defective CD-R.

Usually my LG  GSA-4166B DVDRW (HL-DT-ST) shows Transfer mode as Ultra DMA Mode 4.  It is connected to Secondary IDE as Master and my HDD is Primary IDE Master.

Symptoms:
- using "Process Explorer", hardware interrups is bigger than 10% when using your DVD burner.
- high CPU usage, near 100%

Check this too:

1. Go to Device Manager (Right-click My Computer>Properties>Hardware Tab>Device Manager);
2. Expand IDE ATA/ATAPI Controllers and click on your DVD IDE Channel;
3. Click Properties button and select the Advanced Settings Tab;

If the Transfer Mode is PIO and not DMA, this is your problem!

Start by doing this (at your on risk):

1. Check that you have a 80 pin shielded IDE cable installed

2. Run: regedit

3. Find the following KEY:
 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\000x

4. The last four digits will be 0000, 0001, 0002, 0003, and so on.

5. Usually they are, depends on your system configuration, the following:

0001 is for "Primary_ide_channel" (see DWORD = MatchingDeviceId)
0002 is for "Secondary_ide_channel"
and so on.

Under your "DVD burner" KEY, delete the occurence of the following value:

- MasterIdDataChecksum
- or SlaveIdDataChecksum

depending were your DVD burner is connected.

6. Reboot the computer. Windows will now redetect DMA settings.

This worked for me.

Cheers!