Device Settings Are Hard to Find in Windows XP (Q310751)
When you attempt to configure the direct memory access and programmed input/output (DMA/PIO) settings for a device on a Windows XP-based computer, you do not find the settings in the Properties dialog box for the device. In addition, Help does not provide the location of the settings.
This behavior occurs because the DMA/PIO settings are configured for each controller instead of for each device.
Click here for the kb article from Microsoft
I’ve read of some people having trouble with their dvd drive after an xp upgrade, and it’s because XP treated it as an DMA(Direct Memory Access) device when it probably should’ve been PIO(programmed input/output).