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+---
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+author: Sam Hadow
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 When downloading virtual machines they're usually packaged in an OVA file (Open Virtual Appliance). An OVA file is actually just a single file archive with an OVF package inside.  
 An OVF package contains the metadata decribing the virtual machine (usually a .ovf file) and the virtual disks. The OVF standard doesn't specify a disk image format.  
 Virtual machines made using vmware, virtualbox or Microsoft hyper-V are usually using disks in the vmdk, vdi or vhd/vhdx formats respectively, which are then packaged in the OVA file. However, while QEMU/KVM can read them, there are not the prefered formats. We'll see here how to convert them to a more appropriate format.