The access to a VFAT partition often gets implicitly set to read-only when there are access/read errors. In order to check and solve these try the following steps. Be aware to use the right device, else you can damage your system!

1. Try to save valuable data from the drive by copying it to some other drive or your home directory.
2. Unmount the drive.
3. Check for problems with sudo fsck.vfat /dev/...
4. If fsck reports errors, try to repair them: sudo fsck.vfat -a /dev/....
   For more thorough checks see also the -t and -V options, as well as -f to try saving the content of damaged files.
5. If that doesn't help, try to format the drive: sudo mkfs.vfat /dev/....
6. If that still doesn't help, or the problem reoccurs, the drive may be damaged badly and should be discarded.

The access to a VFAT partition often gets implicitly set to read-only when there are access/read errors. In order to check and solve these try the following steps. Be aware to use the right device, else you can damage your system!

1. Try to save valuable data from the drive by copying it to some other drive or your home directory.
2. Unmount the drive.
3. Check for problems with sudo fsck.vfat /dev/...
4. If fsck reports errors, try to repair them: sudo fsck.vfat -a /dev/....
   For more thorough checks see also the -t and -V options, as well as -f to try saving the content of damaged files.
5. After fsck has finished you can remove and reconnect the drive and try again to access it.
6. If that doesn't help, try to format the drive: sudo mkfs.vfat /dev/....
7. If that still doesn't help, or the problem reoccurs, the drive may be damaged badly and should be discarded.