DMA trouble

[Sergey Fradkov]

Hi,

I have master Asus CD at secondary IDE channel. After installation of XP I
have selected "DMA if available" option instead of "PIO only" for master
device on secondary channel. Then, after reboot, Windows XP has set DMA mode
for my CD-ROM. But after some time I've noticed that CD-ROM works slowly and
I was surprised when I saw "DMA if available" but real "PIO" mode on
secondary channel. What happens? Why XP has set "PIO" mode for DMA-capable
device while "DMA if available" option selected?

Sergey

[Jason Tsang]

See this page
http://www.microsoft.com/hwdev/tech/storage/IDE-DMA.asp

Because of the errors that are likely happening while trying to access your
CDROM, your transfer speeds are being knocked down to a safe level.

If you want to try to reset the status, goto the device manager, and remove
the devices that are connected to the IDE channel

Then remove the IDE Channel itself, then reboot.


--
Jason Tsang - Microsoft MVP

Find out about the MS MVP Program -
http://mvp.support.microsoft.com/default.aspx

"Sergey Fradkov" > wrote in message
...
> Hi,
>
> I have master Asus CD at secondary IDE channel. After installation of XP I
> have selected "DMA if available" option instead of "PIO only" for master
> device on secondary channel. Then, after reboot, Windows XP has set DMA
mode
> for my CD-ROM. But after some time I've noticed that CD-ROM works slowly
and
> I was surprised when I saw "DMA if available" but real "PIO" mode on
> secondary channel. What happens? Why XP has set "PIO" mode for DMA-capable
> device while "DMA if available" option selected?
>
> Sergey
>
>