ubuntu@ubuntu:~$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 223.6G  0 disk 
├─sda1   8:1    0   500M  0 part 
├─sda2   8:2    0 184.1G  0 part 
├─sda3   8:3    0     1K  0 part 
├─sda4   8:4    0  31.4G  0 part 
└─sda5   8:5    0   7.6G  0 part 
sdb      8:16   1   7.4G  0 disk 
└─sdb1   8:17   1   7.4G  0 part /cdrom
sr0     11:0    1  1024M  0 rom  
loop0    7:0    0 975.9M  1 loop /rofs