The upgrade to the 3.7.1 kernel broke the generation of persistent optical
device rules, and existing rules in 70-persistent-cd.rules no longer worked.
This update fixes the issue by basing the rules on ID_SERIAL rather than
ID_PATH (which is not supported by the new kernel's libata transport class).
After upgrading the package, remove /etc/udev/rules.d/70-persistent-cd.rules
and reboot the machine. This will create a working rules file and restore
the expected symbolic links to optical devices in /dev.