You know, I believe that the SD standard only goes to 2GB, though there ARE companies that are selling larger than 2GB SD cards, but... http://en.wikipedia.org/wiki/Sd_card#Compatibility_issues_with_2GB_and_larger_cards

So SDHC has come along which allows larger sizes. You'd need devices that support it though. Wikipedia says that Class 2 is 2MB/s, btw.

- Jon