I hope this helped each and evey one of you! This is not the only method to using an SD capcard with HD systems but i found this way to be the easiest and way cheaper then buying an expensive capcard and not enjoying it or keeping up with it. Using the gv like i do your price will be about 40$ or a little more if you do not have the 360 cord and male cord but mostly everyone does.
Gv USB 2.0- 35$
or
EZCAP- 5-10$
Splitter- 5$