Perfect solution to linux U disk file read only problem

1. Run the following command on the terminal

tail -f /var/log/syslog

2. Insert U disk with a read-only file system failure

3. Watch the command line output

The output part is as follows:
Jul 8 16:44:50 cslouis-pc kernel: [15595.155904] FAT: Filesystem error (dev sdb4)
Jul 8 16:44:50 cslouis-pc kernel: [15595.155905] fat_get_cluster: invalid cluster chain (i_pos 0)

It can be seen from the above that the file system mounted by U disk is /dev/sdb4, and the file system has failed (FAT: Filesystem error).

4. Enter the following command:

umount /media/ZCF(ZCF is your U drive name, which can be viewed using ls in the media directory)

5. Fix U disk file system failure

sudo dosfsck -v -a /dev/sdb4
After the above five steps, the U disk can resume reading and writing.