Originally Posted by GeoffR
Some Kobos come from the factory with a 4GB card, but they only use the same size partition as the ones with 2GB cards, so it can't be right that the partition is resized to fit the card automatically by a factory reset. Also it would be a bad idea to do that, since the reason for using a smaller partition might be to avoid media faults located beyond the partition.
If I read DavidFor's post properly, the factory reset does not touch the partition size for the KOBOeReader partition so if the factory copy that creates the uSD card has a 2GB partition 3, it will not be resized on a factory reset. OTOH, if you manually resize it, that size will survive a factory reset.