RPI ArchARM Storage

xenon# du -h --max-depth=1 | sort -hr
du: cannot access './proc/548/task/548/fd/3': No such file or directory
du: cannot access './proc/548/task/548/fdinfo/3': No such file or directory
du: cannot access './proc/548/fd/4': No such file or directory
du: cannot access './proc/548/fdinfo/4': No such file or directory
1.6G	.
1.1G	./usr
380M	./var
28M	./boot
14M	./etc
7.0M	./opt
364K	./run
56K	./root
28K	./home
16K	./tmp
16K	./lost+found
12K	./srv
4.0K	./mnt
0	./sys
0	./proc
0	./dev