Live boot, casper-rw issue

I created a live bootable USB for Ubuntu through Rufus 3.14 on Windows 10. I used the persistent storage available there and after booting into Ubuntu, I see a disk partition casper-rw present but I am unable to store anything there or interact with it. Do I need to mount it or do anything else to make it usable?

Solution 1:

casper-rw overlay

Casper-rw is an overlay of the read only Ubuntu filesystem. It is where new "Persistent" programs and data is stored.

The partition file system is ext4 which is not accessible to Windows.

When using the USB in Windows as a data storage device, you can store date in the root partition. (the only partition you can see in Windows). It is best to store the Windows data in it's own folder.

When booted from the USB the Windows date can be accessed read only from the cdrom folder.

If you want to use a USB for data and persistent Ubuntu create it using mkusb see: https://help.ubuntu.com/community/mkusb.

Mkusb can create a Persistent USB that has an option for a NTFS data partition that is accessible to Windows and Linux.

Mkusb can install to the same drive it was booted on: Can a Persistent Ubuntu install be made to the pendrive it was booted from?

An option to a Persistent USB is to create a Full install USB, See: https://askubuntu.com/a/1350124/43926