1. The USB 1.5 loader is a bit dated now and so you would be beter off with a more updated backup loader. Still it's a good standby-check out this guide-at the end is a link for a number of USB loaders you can explore: http://www.wiihacks.com/recommended-...s-usb-hdd.html.
2. Only Wiis with sysmenu versions 4.0 and higher can use SDHC cards.