ubuntu@ubuntu:~$ sudo mkdir /media/a && sudo mount /dev/sda4 /media/a && ls -la /media/a
total 112
drwxr-xr-x 22 root root 4096 Nov 14 11:02 .
drwxr-xr-x 1 root root 100 Nov 17 18:16 ..
drwxr-xr-x 2 root root 4096 Oct 21 15:59 bin
drwxr-xr-x 3 root root 4096 Nov 14 11:02 boot
drwxrwxr-x 2 root root 4096 Nov 14 10:57 cdrom
drwxr-xr-x 5 root root 4096 Oct 21 15:56 dev
drwxr-xr-x 132 root root 12288 Nov 14 11:01 etc
drwxr-xr-x 3 root root 4096 Nov 14 10:58 home
lrwxrwxrwx 1 root root 32 Nov 14 11:02 initrd.img -> boot/initrd.img-4.2.0-16-generic
drwxr-xr-x 27 root root 4096 Oct 21 15:57 lib
drwx------ 2 root root 16384 Nov 14 10:51 lost+found
drwxr-xr-x 2 root root 4096 Oct 21 15:48 media
drwxr-xr-x 2 root root 4096 Oct 19 09:14 mnt
drwxr-xr-x 2 root root 4096 Oct 21 15:48 opt
drwxr-xr-x 2 root root 4096 Oct 19 09:14 proc
drwx------ 2 root root 4096 Nov 14 11:02 root
drwxr-xr-x 11 root root 4096 Oct 21 15:57 run
drwxr-xr-x 2 root root 12288 Nov 14 11:02 sbin
drwxr-xr-x 2 root root 4096 Oct 21 15:48 srv
drwxr-xr-x 2 root root 4096 Oct 16 09:29 sys
drwxrwxrwt 2 root root 4096 Nov 14 11:02 tmp
drwxr-xr-x 11 root root 4096 Oct 21 15:54 usr
drwxr-xr-x 13 root root 4096 Oct 21 15:59 var
lrwxrwxrwx 1 root root 29 Nov 14 11:02 vmlinuz -> boot/vmlinuz-4.2.0-16-generic