[ubuntu] best setting for usb memory stick?

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http://ubuntuforums.org – What's the best permission and ownership parameters to use for an ext4 formatted usb memory module. At this time I can access it in my own user account, but when I go to move some files from my user account to the super users account, it fails. If I change the ownership to 'superuser', it works fine in the superusers account, but not in my account and visa versa. Also, if I want to copy or move any file to or from the usb module, what's the best ownership and permission settings??? TIA Art (Hardware)