> This command:
>
>    $ cd /directory/of/mounted/loopback/iso/..

Aaaaah.  Sorry, didn't see that.

>
>
> changes to the directory right above the mount point (the '..' at the end). And no, you shouldn't try to umount a file system you are using (as your current directory). It might leave you in a place that is undefined and *pop* you would be gone. ;-)

I was kinda tired when I looked at your first post.  Sorry.

sim