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Can't enable DMA-- help!

Y

yknott

Member
I have a msi k7t266 pro2 version 2.0 . It has a via kt266 northbridge and is running windows xp pro. The problem is... I can't enable DMA for any devices on the secondary IDE connection! My DVD drive and burner are all running on PIO mode. I've updated the bios to the latest version.. installed the latest 4in1 drivers... made sure im running a UDMA 66 cable.. and triple checked the setting in windows xp to enable DMA. Yet everytime I boot up.. i get that my optical drives are in PIO mode. The primary IDE channel works great. I get DMA mode for both my hard drive and my DVD+R/w drive. Any one know what i can do to fix this?
 
The BIOS has first say on what mode the drives use. Go into the BIOS and set the drives to use DMA mode there, instead of PIO mode. If it won't "stick," then 🙁 I've had that situation before and wasn't able to resolve it.
 
What pio mode is your optical drives using? pio mode 4 is basically the same as udma-2. Majority of dma supported optical drives are dma-2. If you can't get them to use dma then select pio 4
 
yknott, go open up Device Manager, right click and uninstall the secondary IDE channel. Reboot and let Windows XP redetect the channel and install it.

techfuzz
 
Originally posted by: Viper96720
What pio mode is your optical drives using? pio mode 4 is basically the same as udma-2. Majority of dma supported optical drives are dma-2. If you can't get them to use dma then select pio 4
Click to expand...

Hell no. PIO mode 4 gives around 12 MB/s with 100 percent CPU load, while UDMA2 is around 29 MB/s at around 5 percent.
 
Techfuzz

I did as u said and it worked!!!! Thank you very much! Thanks to everyone who contributed 🙂


yknott
 
I must have mixed up dma with udma or something. Because I looked up pio modes and it says max transfer rate of 16.6MB/sec. DMA mw2 has 16.6MB/sec also.
 
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