Go to C:\Program Files\Oracle\VirtualBox and open VBoxManage.exe in command prompt. Run following command to convert .vmi file to .vmdk: clonehd D:\Ubuntu.vdi D:\Ubuntu.vmdk -format VMDK -variant standard This will convert D:\Ubuntu.vdi to D:\Ubuntu.vmdk “C:\Program files\Oracle\Virtualbox\vboxmanage” clonehd –format VDI