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Date: Fri, 14 Jul 2017 12:44:49 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: "Eugene M. Zheganin" <emz@norma.perm.ru>
Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>
Subject: Re: mdconfig and UDF
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On Fri, Jul 14, 2017 at 02:31:15PM +0500, Eugene M. Zheganin wrote:
> Hi.
> 
> 
> Is there any chance to mount UDF filesystem under FreeBSD with mdconfig 
> and ISO image ? Mount -t cd9660 /dev/md0 /mnt/cdrom gives me the 
> readme.txt with "This is UDF, you idiot" and mount -t udf /dev/md0 
> /mnt/cdrom gives me
> 
> 
> # mount -t udf /dev/md0 cdrom
> mount_udf: /dev/md0: Invalid argument
> 
> 
> So...

Most likely this has nothing to do with md(4), but due to old UDF fs driver
not supporting the supposedly newer version of UDF layout you have.  It is
a guess only, but not groundless.