Mount the filesystem of device dev/sdb to the directory /mnt:
mount /dev/sdb /mnt
Mount the filesystem of type ext4 to the directory /mnt:
mount -t ext4 /dev/sdb /mnt
Mount filesystem in read-only mode with ro option:
mount -o ro /dev/sdb /mnt
Force the execution of the mount operation even if the filesystem is already mounted:
mount -f /dev/sdb /mnt
Cancel all error handling behaviors in the filesystem:
mount -E /dev/sdb /mnt
Specify ext4 filesystem type and mount in read-only mode:
mount -t ext4 -o ro /dev/sdb /mnt