DMA on optical drive

[Mikkel L. Ellertson]

Michael Klinosky wrote:
> Mikkel:
>> Well, it depends on the drive. Not all optical drives support DMA,
>> but any fairly new drive should. You can use hdparm to see the
>> current settings, check what the drive supports, and to change the
>> current settings. Depending on your BIOS, it may also possible to
>> set DMA support for a specific drive. To get good performance from
>> your drive, you will want DMA turned on.
> 
> I checked the bios - only 'on' and 'off'. No way to select the unit.
> 
> hdparm states that these drives support sdma0-2 and mdma0-2, and that
> mdma2 is enabled.
> 
> I couldn't figure out which parameter to use to change the setting.
> 
It looks like you are already using DMA. You may want to check your
logs to see if you are getting read errors on the drive. A dirty
drive, or a bad disk will also slow things down.

Mikkel
-- 

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