hahaha reduced sized mmc, as the name implies, is the smaller
version of mmc. my 7610 is using rmmc but i think 6230 is using the
normal sized ones. rmmc comes with an adapter which u have to
attach if u wanna insert the card into a card reader.
for memory size, i am not too sure, but a friend of mine also using
7610 told me that he is having some problems with his 512mb rmmc. i
had forgotten what knid of problem is that but i remember him
telling me its better to go for 256mb.. don't know why.