How can I force Multi-Word DMA 2 by registry settings?

[John]

In a same machine I've installed Win98SE and WinXP Pro, 2 hard disks (both
master) and 1 CD Recorder drive (secondary slave), that supports Multi-Word
DMA 2 (16,7 Mb/s).

Win98SE sees DMA in all drives.
WinXP instead set UltraDMA only for hard disks. CD Recorder drive is set to
PIO Mode!
The WinXP setting for CDROM drive is correctly "Use DMA if available", but
it works in PIO Mode.
I upgraded CD Recorder LG GCE-8240B drive to latest firmware.

How can I force Multi Word DMA 2 for CD Recorder drive in XP by registry
settings?
I know exist key "EnableUDMA66" to force UltraDMA66, but does it exist a key
to force "Multi Word DMA 2" ?
Thank you very much

 

[Jason Tsang]

Goto your device Manager
remove the CDR
Remove the device that is the secondary master
Remove the Secondary IDE channel
Reboot

Afterwards, you should be able to put your CDR into MW-DMA2

Your transfer speeds were most likely forced down to PIO due to repeated DMA
errors, see info at
http://www.microsoft.com/whdc/hwdev/tech/storage/ide-dma.mspx