I took a deep breath, sorry.

The fundemental problem is we have two variables here:

mini + micro and
SD + SDHC

I know Micro and Mini can adapt as long as they are both SD. Presumably they could as well if they were both SDHC -- but I cannot find an adapter that does it. Without that, you cannot go above 2 GB becasue there is no adapting between SD and SDHC.

Does this make sense?