Virtual Disk size not consistent with /dev/sda1 in virtual box

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http://stackoverflow.com – I am running a Oracle VirtualBox on my Windows machine. Created a Linux VM with hard disk of capacity ~100G. In settings of VirtualBox the virtual disk size is shown as 100 G, but then df -kh (inside VM) gives: Filesystem Size Used Avail Use% Mounted on /dev/sda1 5.1G 4.3G 550M 89% / none 4.0K 0 4.0K 0% /sys/fs/cgroup Not sure why it is Inconsistent and currently I am running out of disk space. Output of fdisk -l /dev/sda is : Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors Units = sectors of 1 (HowTos)