Why is my DVD /dev/cd0 instead of /dev/acd0 after recompiling kernel?!?

Beecher Rintoul akbeech at gmail.com
Thu Oct 13 01:05:40 PDT 2005


On Wednesday 12 October 2005 11:45 pm, Olaf Greve wrote:
> Hi,
>
> Well, yesterday the inevitable finally happened: I lost my
> 'custom-kernel-compilation' virginity. :)
>
> Indeed, when trying to burn a DVD using growisofs I quickly found out
> (tnx Google!) that I had to add the atapicam device to the kernel.
>
> This was done based on what I read here:
> http://www.freebsdforums.org/forums/showthread.php?t=152&goto=nextnewest
> http://lists.freebsd.org/pipermail/freebsd-questions/2003-November/026484.h
>tml
>
> Now, similarly to what is described in those threads, on my box the DVD
> is now also solely accessible through /dev/cd0 instead of /dev/acd0
> (what it previously was).
>
> Does anyone have any idea why this is?

From atapicam(4):
The ATAPI/CAM module allows ATAPI devices (CD-ROM, CD-RW, DVD drives,
     floppy drives such as Iomega Zip, tape drives) to be accessed through the
     SCSI subsystem, cam(4).

SCSI CD/DVD devices are labeled as cd, atapi devices are labeled acd.

>
> Also: I just changed the entry for this device to cd0 in /etc/fstab such
> that the command "mount /cdrom" works again.
>

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