Hi Marisa Ferreira,
In general, USB 2.0 and USD 3.0 are backwards compatible, so the connection type may be a problem if the DVD device specifically excludes other than USB 2.0 because of lack of drivers. If that is the case, you may not be able to use a USB 3.0 connection with your DVD. Can you confirm that the hard drive working fine when connected to a PC for example?
Hope this helps