Why am I getting low disk space usage? [closed]

Question

I have problems understanding my disk space usage. I am using Ubuntu 12.04. I am recently going low on disk space and I cannot understand why. Here is the result of du (only largest folders).

716.0K  Videos
1.1M    giorgio2.pdf
1.7M    2011_Thesis_Caroline_Ferdinand.pdf   
2.1M    031022_1.pdf
2.4M    dgfem
29.7M   aux
362.6M  Papers
479.3M  Desktop
588.6M  Documents
1.8G    vtk
3.0G    Dropbox
38.0G   Pictures
105.9G  Music

Here is the result of df -h

 Filesystem      Size  Used Avail Use% Mounted on
 /dev/sda6       322G  304G  1.4G 100% /
 udev            3.9G  4.0K  3.9G   1% /dev
 tmpfs           1.6G  940K  1.6G   1% /run
 none            5.0M     0  5.0M   0% /run/lock 
 none            3.9G  736K  3.9G   1% /run/shm

What I don't understand is where the 304G used come from. The result of du does not sum up to that amount. That make me difficult to free space (as you see I have only 1.4G available). What am I missing here?

I add an image of Disk Usage Analyzer. The point is that the first 10 largest folders sum up to less than 165G. But still my home folder uses 312G.

Answer 1

To get the largest files in a directory, including hidden dotfiles, try running:

du -h .* | sort -h