Tech/VirtualBox.md
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+# Compressing Disks
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+- https://www.howtogeek.com/312883/how-to-shrink-a-virtualbox-virtual-machine-and-free-up-disk-space/
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+
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+## Windows Guest
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+- defrag
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+- `sdelete.exe c: -z`
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+
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+## Host
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+- vboxmanage modifymedium disk some-disk001.vdi --compact
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