Hello.
I found an old post in the forum (Small SDCard library) where talk about your FAT16 library.
I'm having the same space issues and your library seems to be small enough to work for my project, but I can't find a way to format a micro SD card to work with the library examples.
I formatted it in FAT16 but the fat16info.ino example gives an error (because the card size blocks is 512).
Do you know of any utility you could use to format today's SDs to work with the library?