VirtualBox

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  1. Run defrag in the Windows Guest
  2. Nullify free space:

Linux Guest

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

OR

telinit 1
mount -o remount,ro /dev/sda1
zerofree -v /dev/sda1

Windows Guest

cleanmgr
del C:\Windows\SoftwareDistribution\Download
del C:\Windows\Temp
del C:\Documents and Settings\<user>\Local Settings\Temp
del C:\Windows\$Nt*Uninstall*
rem http://cdn.chorke.org/soft/winx/sdelete/sdelete.zip
sdelete.exe c: -z
sdelete.exe d: -z

Compact

VBoxManage modifyhd xp-msql-box.vdi --compact
VBoxManage modifyhd xp-base-box.vdi --compact

OR

VBoxManage.exe modifymedium --compact xp-base-box.vdi 
VBoxManage modifymedium --compact xp-base-box.vdi 
vboxmanage modifymedium --compact xp-base-box.vdi

Knowledge

sudo apt install -y cpu-checker
kvm-ok
virtualbox before start
sudo systemctl stop    libvirtd.socket
sudo systemctl stop    libvirtd.service
sudo systemctl disable libvirtd.service

sudo systemctl start   virtualbox.service
sudo systemctl enable  virtualbox.service

References