What is running, how much disk:
$ top
top - 15:57:06 up 4:58, 1 user, load average: 0.54, 0.46, 0.25
Tasks: 254 total, 3 running, 251 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2.4 us, 0.0 sy, 0.0 ni, 97.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 4025404 total, 299848 free, 3247088 used, 478468 buff/cache
KiB Swap: 1287164 total, 952336 free, 334828 used. 335708 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4223 lbob 20 0 503136 28580 13680 S 2.2 0.7 0:07.00 gnome-term+
1 root 20 0 119888 4056 2944 S 0.0 0.1 0:02.32 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
4 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:+
6 root 20 0 0 0 0 S 0.0 0.0 0:01.16 ksoftirqd/0
7 root 20 0 0 0 0 S 0.0 0.0 0:13.05 rcu_sched
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
10 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 lru-add-dr+
11 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/0
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuhp/0
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
14 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns
15 root 20 0 0 0 0 S 0.0 0.0 0:00.02 khungtaskd
16 root 20 0 0 0 0 S 0.0 0.0 0:00.00 oom_reaper
17 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 writeback
18 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kcompactd0
============
$ df
df: /mnt/hgfs: Protocol error
Filesystem 1K-blocks Used Available Use% Mounted on
udev 1989176 0 1989176 0% /dev
tmpfs 402544 11408 391136 3% /run
/dev/sda1 45044148 16888592 25844388 40% /
tmpfs 2012700 8104 2004596 1% /dev/shm
tmpfs 5120 4 5116 1% /run/lock
tmpfs 2012700 0 2012700 0% /sys/fs/cgroup
cgmfs 100 0 100 0% /run/cgmanager/fs
tmpfs 402544 32 402512 1% /run/user/1000
/dev/sr0 1855008 1855008 0 100% /media/lbob/Linux Mint 18.3 Cinnamon 64-bit