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+---
+title: "Compacting a VirtualBox VDI Image"
+date: 2018-09-06T12:26:00
+tags: ["formats", "guides", "linux", "snippets", "software", "windows"]
+---
+
+Firstly, you'll need to install `zerofree` on your Linux image, then mount the root partition as a read only volume. This can be done via:
+
+```
+sudo apt-get install zerofree
+sudo apt-get clean
+sudo reboot
+# interrupt grub boot and boot into recovery mode
+mount -n -o remount,ro -t ext4 /dev/sda1 /
+zerofree /dev/sda1
+shutdown -h now
+```
+
+And now on the Windows Host:
+```
+"C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" modifyvdi "VirtualBox VMs\server\server.vdi" compact
+```
+
+This should make the VirtualBox image more in line with the calculated size it should be. \ No newline at end of file