How to create and use casper-rw in different USB with a live usb

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http://askubuntu.com – I have created an Ubuntu Live USB using pendrive's Universal USB Installer. I found a link about creating the casper-rw but it's for a Live CD at https://help.ubuntu.com/community/LiveCD/Persistence. How do I create casper-rw and configure the live USB to recognize the casper-rw for persistence? (HowTos)