I already know they are virtual sparce disks, however, the problem is that when I try to copy & paste virtual disk (vol.qcow2) in another path (removable drive), it is still 20GB (not 3.32 MiB), something that does not happen with dynamic disks in Virtualbox.
I have tried editing the .xml file to put
sparce = true # supposedly this option is the one that defines if the disk is dynamic or fixed
But I have not been successful.
What should I do to create a virtual disk with QEMU / KVM / virt-manager in .qcow2 or RAW format and keep it similar size of virtualbox dynamic virtual disks (VDI nd other formats like a VHD, etc)?
PD: Please with QEMU/KVM virt-manager" in linux
thanks in advanced