Vboxmanage/compact

Reduce virtual disk file size

Freien Speicherplatz bereinigen

Linux

dd if=/dev/zero of=/var/tmp/bigemptyfile bs=4096k
rm /var/tmp/bigemptyfile 

or

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

Windows

1. Run defrag in the guest
2. user SDelete from Sysinternals

sdelete.exe c: -z

Vboxmanage

Shutdown the guest VM

Linux Host

Syntax

vboxmanage modifymedium --compact /path/to/thedisk.vdi

Beispiel

# vboxmanage modifymedium --compact windows10.vdi
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

Windows Host

VBoxManage.exe modifymedium --compact c:\path\to\thedisk.vdi

Links

1. https://docs.oracle.com/en/virtualization/virtualbox/7.0/user/vboxmanage.html