Your files in MMC are stored in multiple (disk) blocks.
So if you format using 16K block, the space used will be 16K eventhough your file is just 1K.
If you buy MMC, it is usually preformatted with 16K block. Therefore alot of space is wasted as most installed program files are usually less than 2K.
You will need a card reader to do this:-
1. Connect card reader and copy all your files in the MMC to computer disk. (Make sure you set the show all/hidden/os files to "on")

nice.

Great.Keep it up.