Ah, my bad. :)
* Robert Echlin <[email protected]> [091018 11:32]:
> Hi Bart,
> Thanks for the notes on sdparm. I didn't know about that.
>
> However, it was my system that found the dvd under /dev/scd0
> John was trying to access it as /dev/hda.
>
> Rob
>
>
>
>
> ________________________________
> From: Bart Trojanowski <[email protected]>
> To: Prof. John C Nash <[email protected]>; [email protected]
> Sent: Sun, October 18, 2009 10:58:27 AM
> Subject: Re: [OCLUG-Tech] dma in Ubuntu?
>
> John,
>
> hdparm is really meant for devices that are driven by ide and legacy ata
> drivers. If your cdrom shows up as /dev/scd0, then it's going through a
> subsystem of the Linux kernel that's responsible for SCSI. More
> specifically you're driving your cdrom with "libata" SCSI layer that
> makes IDE/ATA devices look like SCSI ones. Even though the device
> accepts ATA commands, hdparm doesn't know how to talk to it because the
> kernel didn't git it a device that looks like an ATA device.
>
> You probably want to look at the sdparm and sg3-utils packages. Have a
> look at this to learn more about sdparm:
>
> http://sg.danny.cz/sg/sdparm.html
>
> When I last had to use it, I found sdparm a lot harder to figure out
> than the hdparm counter part. I don't have an ATA CDROM anywhere so I
> was unable to actually generate the command you need to flip DMA on.
> Should you end up using sdparm to get this going, I'd like to learn from
> your success.
>
> -Bart
>
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