What's the maximum capacity of the SuperCard SD? I've been getting a slew of different answers. Some say 2GB. others say 4GB. So, what is it exactly? I need to know before I actually make up my mind whether I should buy the SuperCard SD. The only reason I'm looking at the SuperCard SD is because I can purchase a 4GB SD for $40. So, it'd be greatly appreciated if someone could clear the fog. Thanks.