How can I tell what all my disk partitions are being used for? I have 3 disks in my computer, a 1 TB hdd for storage, a ~224gb ssd for windows, and a ~120 gb ssd for ubuntu, which can be seen in the image below. My ubuntu is out of space, I think because I only allocated 20gb to the root system. I'd love to change that, but I allocated 80 gigs to Ubuntu for.... something else, which I'm not quite sure of what. That's why I'd rather be able to see what all these partitions are doing. Can I just format Disk 2 (D:) and start again? I want to be able to use all 111.67 gigs for my ubunutu system.