Most USB keys have a small switch on the outside labeled "lock", this is the read vs read-write tab (as we remember from 3.5" floppy disks), set it to "lock" and its read only.
If that doesn't work for you or if you USB flash thumb drive does not include a switch then you can set the partitions to read-only while you are mounting them.
To always mount them as read-only, you can add RO as an option in /etc/fstab.
Or if the partition is not mounted in /etc/fstab, you can mount it be hand like so:
re: It's possible to make USB
Yes.
Most USB keys have a small switch on the outside labeled "lock", this is the read vs read-write tab (as we remember from 3.5" floppy disks), set it to "lock" and its read only.
If that doesn't work for you or if you USB flash thumb drive does not include a switch then you can set the partitions to read-only while you are mounting them.
To always mount them as read-only, you can add RO as an option in /etc/fstab.
Or if the partition is not mounted in /etc/fstab, you can mount it be hand like so:
mount -o RO /dev/<device> /mnt/<mount-point>