Some versions of Windows do not handle this situation well some Linux distributions do. But it might not, because the OS installed on that IMG is expecting to see the virtual hardware that VirtualBox provides, and you're booting it on real hardware that it isn't expecting. You can 'burn' (write) the IMG onto a hard drive, and it might boot on bare hardware (eg not in a virtual machine). that output IMG file isn't an ISO image, and the OS that's installed will not be configured to run from a bootable CD/DVD. VBoxManage internalcommands converttoraw file.vdi output.imgīut. VBoxManage's internalcommands tool includes converttoraw, which can convert a dynamic VDI into a raw disk image ( source). If you're using a dynamic VDI, and you have an older version of VirtualBox, clonehd may not operate properly.VBoxManage clonehd file.vdi output.img -format RAW If you want to convert your virtual disk to another format, this is the official VirtualBox tool to use. This command clones a registered virtual disk image to another image file. You can convert a VDI into a disk image with the VBoxManage tool.