Persistent USB is new thing to me. I’ve found several places where it is discussed how to make and amend one. https://askubuntu.com/questions/1181854/how-is-it-easier-to-make-a-persistent-live-drive-with-ubuntu-19-10 https://askubuntu.com/questions/1189020/how-can-i-get-a-live-only-drive-with-ubuntu-19-10-and-newer-versions https://askubuntu.com/questions/922692/how-to-edit-a-bootable-usb-stick.
What seems strange to me that I have USB with Linux Mint and also
writable
install logs date-time ...
mount | grep sda3 mount /dev/sda3 /var/logs
but /var/logs looks ordinary, there are no
install logs date-time ...
install logs date-time ...
How can is be done that folders at root of a partition are hidden when mounted when booted from USB cd partition?