Ah, my bad. :) * Robert Echlin <rob [ dot ] echlin [ at ] rocketmail [ dot ] com> [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 <bart-oclug [ at ] jukie [ dot ] net> > To: Prof. John C Nash <nashjc [ at ] uottawa [ dot ] ca>; linux [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca > 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 > > -- > WebSig: http://www.jukie.net/~bart/sig/ > _______________________________________________ > Linux mailing list > Linux [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca > http://oclug.on.ca/mailman/listinfo/linux > > > > __________________________________________________________________ > Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now > http://ca.toolbar.yahoo.com. > _______________________________________________ > Linux mailing list > Linux [ at ] lists [ dot ] oclug [ dot ] on [ dot ] ca > http://oclug.on.ca/mailman/listinfo/linux -- WebSig: http://www.jukie.net/~bart/sig/