Gus Wirth wrote:
rbw wrote:
I'm having a problem writing DVD iso images to DVD-R media. I'm looking for some input on what I am doing wrong and some tips on what to do next. Here is what I have going on so far...

dmesg says
hdc: ATAPI 24X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20
[snip]

One other thing to mention is that you need to check that the DVD drive is actually running in DMA mode. Use the hdparm command to do this. You should see something like this:

$ sudo hdparm /dev/hdc

/dev/hdc:
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device

You can ignore the last line as it's only applicable to hard drives. If the DVD drive isn't running in DMA mode, turn it on with hdparm like this:

$ sudo hdparm -d 1 /dev/hdc

Gus


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