Will a live usb with persistence store files automatically?

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http://askubuntu.com – I'm not even sure if i worded my question right but, I'm familiarizing myself with Ubuntu and want to install it on a new desktop I just finished putting together so I'm trying it on my laptop via live usb first. I had trouble mounting my NTFS windows partitioned disks, solved that problem but I also see a disk that has the exact amount of memory I alloted for persistence. I try to access it but it shows the same ACL error I got when my NTFS disks weren't mounting. I've already downloaded some stuff and made some things with LibreOffice and want to know if those things have been save aut (HowTos)