On Tue, 30 Oct 2012, Bernhard Fröhlich wrote:

On Mon, Oct 29, 2012 at 11:13 AM, Yuri <[email protected]> wrote:
All conditions from section 23.3.3 are satisfied (atapicam is in kernel and
device permissions are right).
But storage screen only allows me to select some iso file to export into
guest. Passthrough checkbox never shows up on the Storage window.
For example, under IDE I see "IDE Primary Master", etc choices, it says
CD/DVD Drive but never offers passthrough (checkbox always stays invisible).

How to understand why isn't passthrough available?

DVD drive is recognized by system as:
cd0 at ata2 bus 0 scbus9 target 0 lun 0
cd0: <PIONEER DVD-RW  DVR-112D 1.21> Removable CD-ROM SCSI-0 device

I've just verified it on my box and it just works. So it's hard to find out what
the problem is. I remember that I had some problems in the past after updating
the kernel but I did not recompile cdrtools or dvd+rw-tools which caused all the
atapi commands to strangely fail when trying to burn a DVD. VirtualBox also
uses that tools so I'd recommend that you just rebuild those two and check
if it helps.

Try setting the VBOX_CDROM environment variable to the drive:

  setenv VBOX_CDROM /dev/cd0

or the sh(1) version:

  VBOX_CDROM=/dev/cd0
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