If you create a folder (most likely as root, because that is what you are now), the folder will only be accessible as root once you are back in FC3.
So, once you are back in FC3, log in as root, and chown the folder with -R to whoever you want.
Code:
chown -R myuser:mygroup myfolder
UNLIKE in Winslows no matter what system you boot from, root is root, and root is the master and everything, and let YOU do with your computer what YOU want.
Even if you have folders or files which you move from one computer to another, or from one system to the other, while you preserve the ownership, the folders will still be accessible by that user. But you have to make sure that the uid of that user is still the same.
jlinkels