Re: Mounting a DVD

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On Thu, 25 Feb 2010 12:02:41 -0600 (CST)
"Jeremy C. Reed" <reed%reedmedia.net@localhost> wrote:

> On Thu, 25 Feb 2010, Steven M. Bellovin wrote:
> 
> > I'm trying, without success, to mount a DVD I burned on MacOS.  I've
> > tried mounting it as udf and as cd9660; both yield "invalid
> > argument" errors.  I have 
> > 
> >     file-system     UDF
> > 
> > in my kernel config.  Anything else I can try?
> 
> "invalid argument" reminds me of my similar thread:
> http://mail-index.netbsd.org/netbsd-users/2010/01/22/msg005451.html
> I never solved it. My wife had the photographer email the photos 
> instead.
> 
I figured out my problem, and the solution was even documented.  The
following text appears under NOTES in mount_hfs(8):

     Apple disk images (.dmg files) and hybrid CD-ROMs contain multiple
     parti- tions with an HFS+ file system on one of them.  Use
     apmlabel(8) to enter it into the disklabel and mount the resulting
     partition.

When I ran 'apmlabel cd0', it said that cd0a had an HFS partition at
(synthetic, I think) cd0a.  I then did 'apmlabel -w cd0', after which I
could do 'mount -r -t hfs /dev/cd0a /mnt'.

I wonder if mount_hfs should look for such things and automatically
DTRT.


                --Steve Bellovin, http://www.cs.columbia.edu/~smb