Cloning win7 VM disk usage on QM is zero

[Franz]

Cloning win7 VM, disk usage on Qubes Manager is zero. How is it possible that a VM that should use more than 20 GB does not use any disk space when cloned? I am using default R4 settings.

[unman]

By default, clone will produce a COW clone. Since your clone has no
difference from the original, it uses no disk space. As you use and make
changes the delta will increase and you will see the disk usage
increase.

unman