When you report a problem, @daemonfowl, please follow the helpful guide in the "perfect newbie" thread that we've pointed you to several times. Ask yourself, "have I posted enough information that someone can recreate my problem or point to an error I have made?"
This problem report is missing critical information. What was the command that was used? Does the exact same command work with other discs? Was this command executed as root or as user? Does the directory /home/bifrost/cdrom exist? What are its access controls?
If you slow down before posting, and think of what questions we might ask before submitting your problem reports ... you might get useful responses.
Personally, I have never used "cd0a" -- because there is no "a" partition. I use "cd0c" as "c" is the reserved partition for the entire device. Whether this has any bearing on your problem... I have no idea.
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