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Old 10-08-2007, 01:20 AM   #1
Registered: Aug 2005
Location: Montreal
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DMA for SATA disk

Hi all,

I am trying to set up my linux to read dvd movies .. i have install all the libraries and the codecs.

Now my computer reads the DVD but its very jerky .. so i realized i needed to turn on the DMA on for th drive

however when i issued the command i got :

ANKIT-LAPTOP:/dev # hdparm -d1 /dev/dvd

 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Inappropriate ioctl for device
 HDIO_GET_DMA failed: Inappropriate ioctl for device
did a bit of googling and found out that hdparm does not support SATA drives ....

now my question is what can i do to turn on the DMA ? right now it takes over an hour to burn a DVD ?!

thanks for all the help
Old 10-08-2007, 06:33 PM   #2
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You may want to start by checking your BIOS settings.
Old 10-08-2007, 08:13 PM   #3
Registered: Mar 2007
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More than drive access parameters can give you choppy video. Check your video card setting and make sure you have some sort of video acceleration enabled for the video card. Video was jerky on my system till I re-install the video drivers.
Old 10-08-2007, 08:29 PM   #4
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Sata uses sdparm although for some reason I still have to use hdparm for my SATA disks (it seems to me that my motherboard isn't fully supported yet). optical drives, by the way, don't support the high DMA modes that hard drives do. I can get DMA7 for my hard drives but no more than 3 for the optical drives.

As pointed out above, it could just as well be a video driver issue. Play around with the output options (xv, gl, etc.) to see whether it makes a difference. But that wouldn't explain why it takes an hour to burn a dvd, that does seem a DMA issue.

Last edited by jay73; 10-08-2007 at 08:30 PM.


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