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Getting back to DMA mode in Windows XP
November 15, 2003 Views (97,995) / Comments (120) / Trackback (0)
CD-ROM and DVD-ROM drives can revert to using PIO mode, despite being set to use â€œDMA if Available.â€ Hereâ€™s how to make Windows XP redetect the DMA capabilities of the drives.
This behaviour occurs with the following conditions:
Windows XP is the operating system
A CD-ROM or DVD-ROM drive, which is known to support DMA mode now works only in PIO mode.
The drive controller is set to use â€œDMA if availableâ€ but reports to be only in PIO mode.
Following is the mechanism that has worked for me, please try it at your own risk, it involves hacking the registry:
Find the following KEY:
The last four digits will be 0000, 0001, 0002, 0003, and so on.
Under each key, delete all occurences of the following values:
Reboot the computer. Windows will now redetect DMA settings.