Disk showing 0 available but not all used?

Just installed a default installation of Leap 15.1 and have a 2TB hard drive.

I've copied about 500GB to the server and now its showing 0 space free.
Size 1.9TB
Used 604GB
Free 0

That doesn't add up?

Code:Filesystem Size Used Avail Use% Mounted on
devtmpfs 849M 4.0K 849M 1% /dev
tmpfs 867M 8.0K 867M 1% /dev/shm
tmpfs 867M 28M 839M 4% /run
tmpfs 867M 0 867M 0% /sys/fs/cgroup
/dev/sdb3 1.9T 604G 0 100% /
/dev/sdb3 1.9T 604G 0 100% /srv
/dev/sdb3 1.9T 604G 0 100% /.snapshots
/dev/sdb3 1.9T 604G 0 100% /usr/local
/dev/sdb3 1.9T 604G 0 100% /root
/dev/sdb3 1.9T 604G 0 100% /var
/dev/sdb3 1.9T 604G 0 100% /boot/grub2/i386-pc
/dev/sdb3 1.9T 604G 0 100% /opt
/dev/sdb3 1.9T 604G 0 100% /tmp
/dev/sdb3 1.9T 604G 0 100% /home
/dev/sdb3 1.9T 604G 0 100% /boot/grub2/x86_64-efi
tmpfs 174M 0 174M 0% /run/user/1000Code:/dev/sdb1 2048 4095 2048 1M BIOS boot
/dev/sdb2 4096 20479 16384 8M BIOS boot
/dev/sdb3 20480 3902834687 3902814208 1.8T Linux filesystem
/dev/sdb4 3902834688 3907029134 4194447 2G Linux swapCode:suse:/ # du -s -h *
2.1M bin
57M boot
12K dev
48M etc
598G home
760M lib
9.9M lib64
0 mnt
42M opt
4.2M root
28M run
8.7M sbin
0 selinux
352M srv
0 sys
3.2M tmp
2.0G usr
773M varWhat am I missing?