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May 21, 2020

How to compact VirtualBox's VDI file size? - Super User
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  • dd if=/dev/zero of=/var/tmp/bigemptyfile bs=4096k ; rm /var/tmp/bigemptyfile
  • See progress in dd terminal by sending kill -USR1 <PID>
  • Stop the VM
  • vboxmanage modifymedium --compact /path/to/thedisk.vdi
  • "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" modifymedium --compact /path/to/thedisk.vdi