You can make files read-only.
If it's formatted NTFS, you can specify authorisation for specific users.
Some USB-sticks have a switch to disallow write access. Without such a switch, you can always format them to erase everything.
Hello, today I come again to this forum to ask this question:
Can I do something for my USB can not be formatted? That is, you can not delete files containing
·----- --··· ·-----