Thread: DMA on/off
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Old June 13th 04, 06:29 PM
SleeperMan
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DaveB typed:

Mydvd writer is reading dvds at single speed ..and it is really
frustrating....

Can some kind soul put me out f my misery and tell me how to turn DMA
back on (enable)

Thanx as always

Dave


If you run XP, i think this is what you wanted:

Getting back to DMA mode in Windows XP


CD-ROM and DVD-ROM drives can revert to using PIO mode, despite being set to
use "DMA if Available." Here'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 "DMA if available" 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:

Open RegEdit

Find the following KEY:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\
Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\000x

The last four digits will be 0000, 0001, 0002, 0003, and so on.
Under each key, delete all occurences of the following values:
MasterIdDataChecksum
SlaveIdDataChecksum
Reboot the computer. Windows will now redetect DMA settings.
Trala!