Originally Posted by GeoffR
The factory reset doesn't use the 10Mb at the beginning of the card. What is probably hapenning is when the partition is formatted during factory reset the mkfs.vfat tool is able to get more usable space from the enlarged partition than the partition extension tool could. The same thing happens when I reformat a USB stick partition from Linux that was originally formatted from Windows, the usable space on the partition increases a little bit.
Thanks! I'll update my post right now