ubuntu-mate@ubuntu-mate:~$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk
├─sda1   8:1    0   100M  0 part
├─sda2   8:2    0  95.6G  0 part
├─sda3   8:3    0 117.2G  0 part
└─sda4   8:4    0   253G  0 part
sdb      8:16   1   3.7G  0 disk
└─sdb1   8:17   1   3.7G  0 part /cdrom
sr0     11:0    1  1024M  0 rom
loop0    7:0    0   1.5G  1 loop /rofs