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From: perryh@pluto.rain.com
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Cc: freebsd-questions@freebsd.org
Subject: Re: Support of UDF ISO-13346 on 7.1-RELEASE-p2
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Bryant Eadon <bryant.eadon@gmail.com> wrote:
...
>    sudo mount -t cd9660 /dev/md0 /mnt/iso/
> ## lists only a single file 'readme.txt' :
> This disc contains a "UDF" file system and requires an operating
> system that supports the ISO-13346 "UDF" file system specification.
> ##  lovely ..
>    sudo mount -t udf /dev/md0 /mnt/iso/
>    mount_udf: /dev/md0: Invalid argument
> ##
> Not very helpful ... especially since kldstat shows I have udf.ko
> loaded.

Did you remember to

  sudo umount /dev/md0

before attempting to mount it as udf?  It can't be mounted as both
types at the same time :)