update udev rules on ubuntu

I’m trying to map a bunch of DVD drives to names on unbuntu and mucking around in the udev rules directory.
I found an easy way to get things matched up is to put in a DVD and use ‘df’ command to see where the filesystem has mounted it, for example ‘/dev/scd0’
Then to find the address use ‘udevadm info –query=all –name=scd0’
This provides the info that needs to go into 70-persistent-cd-rules file