Using SD cards isn't the most cost effective way to add extra space. Ahh, that was a Wal-Mart black friday special, hence why the specs on it arn't so great. Throw this badboy in their. If you fill that up, well, time to get a desktop or external USB Terabyte drive. May not be as portable but hey, you can't have everything
http://www.newegg.com/Product/Produc...82E16822136314
Hell, this ones on sale right now, go for it
http://www.newegg.com/Product/Produc...82E16822136459