Compact vbox disk

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Compact vbox disk

  • run defrag in the guest (Windows)

  • nullify free space:
    With Linux guest run this:

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    sudo dd if=/dev/zero of=/bigemptyfile bs=4096k
    sudo rm -rf /bigemptyfile

    With Windows guest, download SysinternalsSuite and run this:

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    sdelete –z

  • shutdown the guest VM

  • now run VBoxManage’s compact command

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    VBoxManage.exe modifyhd thedisk.vdi --compact