How can mount freebsd disk partition with read and write permission in deban?

My freebsd installed on /dev/sdb2,it can mount with read permission: sudo mkdir /mnt/freebsd sudo mount -r -t ufs -o ufstype=ufs2 /dev/sdb2 /mnt/freebsd How can mount it with read and write permission then? sudo mount -rw -t ufs -o ufstype=ufs2 /dev/sdb2 /mnt/freebsd mount: /mnt/freebsd: /dev/sdb2 is write-protected but explicit read-write mode requested.