Resize2fs - fs 5pc lost space

When a file system is created, 5% of all blocks are reserved for the super user (for writing logs etc.).If this disk is only for storing files (and e.g. doesn’t contain /var/) you can set this to 0% (or you may keep 1% just in case):

tune2fs -m 0 /dev/sda5

Sources:

  • http://askubuntu.com/questions/79981/df-h-shows-incorrect-free-space