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how to force DMA

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Name: Shmanda
Date: September 20, 2003 at 03:07:50 Pacific
OS: WinXP Pro
CPU/Ram: P4 2.66
Comment:

I have two Seagate HDs on my primary IDE controller. One came OEM with my Dell and the other I installed. That second one is not the boot disk, it just has a few partitons for storage.

The thing is, I know both drives support DMA (from website), but only my boot drive is using it. The storage drive is not. The transfer mode for both channels is set to "DMA if available" in Device Manager. Do I need to update the driver or something? I'm having a hell of a time burning discs with data from that drive because it is so slow.



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Response Number 1
Name: Johnw
Date: September 20, 2003 at 06:38:13 Pacific
Reply:

Enabling DMA in XP .
http://www.blackmaxpc.com/Guides/DMA.htm
http://www.xtremepccentral.com/foru...9/2002/05/1/885
http://www.microsoft.com/hwdev/tech/storage/IDE-DMA.asp
http://www.cdrlabs.com/phpBB/viewtopic.php?t=7625

Problems enabling DMA in XP .
http://www.cdrlabs.com/phpBB/viewtopic.php?t=6645

http://www.compguysinc.com/techweb/hardware/dma66.shtml

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Just like Windows 2000, Windows XP still fails to set the DMA mode correctly for the IDE device designated as the slaves on the primary IDE and secondary IDE channels. Most CD-ROMS are capable of supporting DMA mode, but the default in XP is still PIO. Setting it to DMA won't make your CD-ROM faster, but it will consume less CPU cycles. Here's how:

Open the Device Manager. One way to do that is to right-click on "My Computer", select the Hardware tab, and select Device Manager.

Expand "IDE ATA/ATAPI Controllers" and double-click on "Primary IDE Channel".
Under the "Advanced Settings" tab, check the "Device 1" setting. More than likely, your current transfer mode is set to PIO.

Set it to "DMA if available".
Repeat the step for the "Secondary IDE Channel" if you have devices attached to it. Reboot


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