I recently bought one of these fantastic Lacie drives. The problem is that iDVD will not let me write to anything other than a superdrive. Then I found this thread. Download the file from there (mirrored here) extract the archive and place the 2 files in your home account. Control click on either the burn dvd button or the burn dvd menu item and it should present you with a list of dvd writers attached to the machine, or the option of writing to a img file.