Re: Adobe Elements catalog backup fails after 3 discs. Message says something wrong with dvd writer. I bought an external dvd burner and changed disc brands, still the same results.

If you have the hard drive space, see if you can complete a back up to the hard drive instead. If that works successfully, it could be a buffer or caching issue with the burner. It could be running out of space because it is not clearing after each disk burn.