Virtualbox - no /dev/acd0 in VM even if it's booting from CD

Volodymyr Kostyrko c.kworr at
Mon Jan 24 21:44:08 UTC 2011

24.01.2011 15:22, Arthur Chance wrote:
> I just upgraded to virtualbox-ose-3.2.12 (ditto the vbox kmod port), and
> then tried to install a new VM. It booted from the CD fine but
> sysinstall reported that it couldn't find a CD drive to install from.
> Booting another VM that already existed showed the same problem -
> /dev/ad0 exists but /dev/acd0 doesn't and there's no sign of it during
> the device detection part of the boot.
> Anyone else seeing this problem?
> Details:
> The host machine is amd64, running 8.1-RELEASE-p2 GENERIC.
> The new VM is booting FreeBSD-8.1-RELEASE-i386-disc1.iso
> The old VM is running i386 8.1-RELEASE-p1 GENERIC, and can't see
> /dev/acd0 regardless of whether or not an ISO is attached to it.

VBoxManage showvminfo machine | grep Storage

Most likely you are using ICH6 based IE controller. Try switching to PIIX4.

Sphinx of black quartz judge my vow.

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