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Reduce the size of a dynamic VDI file in VirtualBox

I have got a Virtualbox with debian to build up windows machines using unattended. This virtual HD went up to 54Gb but internaly on 28Gb were used. So when I wanted to move out of that machine it took ages. I wonder if there is a easy way to clean up.
Found it.

start with liveCD,
install zerofree ( apt-get install zerofree)
zerofree /dev/sda1

When finish shutdown the virtual machine and execute on the host system:

VBoxManage modifyhd vdi_file.vdi compact

HOWTO: Reduce the size of a dynamic VDI file in VirtualBox

 

update:  SytemRescueCD have zerofree installed by default as for version 3.1.0

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