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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Gary Kline <kline@thought.org>
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Cc: tajudd@gmail.com, perryh@pluto.rain.com, Polytropon <freebsd@edvax.de>,
	freebsd-questions@freebsd.org
Subject: Re: how to create a DVD backup filesystem?
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> 	cdr.iso:            ISO 9660 CD-ROM filesystem data 'CDROM
> 	642848 -rw-r--r--   1 kline  wheel  657922048 Jan 24 15:34 cdr.iso
>
> 	what is the safest command to use to burn to 1. a CD, and 2. a
> 	DVD?  Since `file' says that cdr.iso is a filesystem, I'm

if it ISO9660 filesystem image.

you may check it before writing this way

mdconfig -a -o readonly -t vnode -f cdr.iso
mount_cd9660 /dev/md0 /mnt

then after checking

umount /mnt
mdconfig -d -u 0

(assumed you don't use other md devices that moment, if so, device number 
will not be md0)

> 	assuming that I don't need to grow or newfs anything on the disc.

cdrtools for CD
dvd+rw-tools for DVD