Where has my hard drive space gone?

I have a Dell Inspiron 3793 running Windows 10 Home version 1909. The C drive is a 256GB SSD, and I am noticing a bunch of unaccounted for hard drive space (see pictures below). Drive properties show 163GB used, but when I select all the files they...

I've got a computer with a ~120G SSD and a larger HDD. I've made a real effort to keep anything discretionary off the SSD, but as I'm a (new) developer there are lots of installs, and the space keeps creeping up. The plan had been to install a...

I'm going under Computer Management>Disk Management and have deleted a partition which gave me the unallocated 48gb, and I'm trying to add that unallocated space to the main drive (C), and it's not letting me, When I right the C drive there is only...

I have a lot of hard drives on quite a few pc's. I have always read that you should keep a minimum of 15% of free space on any hard drive, which I do on all of my hard drives (7 I think). I recently bought a LIVA MINI-PC and instead of a hard...