Funny story, interesting that Linux works that way - I wouldn't have 
known that (but then it took me almost a week to get my bitTorrent 
client write access to an external hard drive under Linux).

> Fortunately, the fix is very simple. You just need to add a check for
> the possibility of there being zero devices.

I guess you can use this as a lesson to try and dream up some more 
possible failure modes (eg something else uses up disk space whilst you 
are installing, or ...). It only takes a half hour session and you might 
be surprised what other things you can't handle.

Also it would seem to me to make sense to have a "catch all" type check 
at the end of the installation (eg count folders/files or file sizes or 
md5 on the supposedly installed folder) to really be 100% sure the 
installation worked. At least then if it fails for some crazy reason 
you'll catch it.

> Also, somebody give that tester a medal. There's no way in hell we would
> have thought to actually *test* for such an obscure condition.

You shouldn't give him a medal then... just saying.

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