I'm seeing sustained disk writes of about 2 MB/s in the indicator-multiload indicator in Unity. I determined that it is writes on my 500GB HDD on /dev/sdb. This behaviour started after I used Gparted to create a single 500GB ext4 partition and also selected that it should be formatted to ext4 in Gparted.
Is this usual? It also survived a reboot.. I assume that it is the full formatting taking place in the background?
I saw no activity using pidstat or iotop. Only using vmstat -d revealed the writes.