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Authentication is disabled (development mode).
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<pre><code class="language-bash">mkdir /z mount -o ro /dev/sda1 /z /z/usr/sbin/zerofree -v /dev/sda1 sudo mount -n -o remount,ro / sudo zerofree -v /dev/sda1 VBoxManage modifyhd --compact path_to.vdi</code></pre>
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