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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11To use an .img file as a VirtualBox virtual machine’s hard disk, first confirm it is a raw disk image, convert it with VBoxManage convertfromraw, then attach the resulting virtual disk to a VM. The extension alone does not confirm that the file is raw or bootable.
Before you convert the image
- Keep the original file unchanged. Work on a copy or make sure you have a known-good backup.
- Check what the image contains and which operating system it is meant to run. The
.imgsuffix does not identify its format, prove it represents a complete disk, or guarantee it can boot. - Have a VirtualBox VM configured for the intended guest OS. Firmware and hardware settings depend on the image and cannot be prescribed without knowing its origin.
Convert a raw .img file to a VirtualBox disk
Oracle documents VBoxManage convertfromraw for converting a raw disk image into a VirtualBox virtual disk. VDI is the default output format.
- Open a command prompt or terminal on a system where VirtualBox is installed.
- Run the conversion command, replacing the example names with the actual paths to your input image and destination file:
VBoxManage convertfromraw input.img output.vdi - Wait for conversion to finish. The resulting
output.vdiis the virtual disk to attach to the VM. Keep the source image as a fallback.
Oracle’s VirtualBox 7.2.2 User Guide describes this command as converting a raw disk image to a VirtualBox virtual disk image (VDI). If VirtualBox cannot read the input, verify that it is a raw disk image rather than assuming its filename extension is sufficient.
Choose a different output format only if you need it
VDI is the straightforward default for VirtualBox. The command also supports VMDK and VHD; select one when another tool or workflow requires it.
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| Choice | When it fits | Documented behavior |
|---|---|---|
| VDI | Default choice for a VirtualBox disk | Default output format |
| VMDK | When a workflow requires VMDK compatibility | Supports variants including Split2G, Stream, and ESX; these serve specific needs and are not interchangeable in every combination |
| VHD | When a workflow requires VHD | Supported output format |
For example, to request VMDK explicitly, run:
VBoxManage convertfromraw input.img output.vmdk --format VMDK
The manual describes the Standard variant as dynamically allocated and Fixed as fixed size. For VMDK, Split2G divides the image into 2 GB segments, Stream is optimized for downloading, and ESX is intended for some VMware products. Use a special variant only when the destination workflow calls for it; incompatible variant combinations fail.
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Attach the converted disk to a VM
- Create or select a VM configured for the operating system in the image.
- Open the VM’s storage configuration and attach the converted
.vdi(or your chosen VMDK or VHD) as its virtual hard disk. - Start the VM. If it does not boot, investigate whether the image is bootable and whether the VM’s firmware and hardware configuration match the source system. The right settings depend on the image.
Some Windows guests may need the new VM configured similarly to the old one, according to the VirtualBox manual. A successful conversion creates a virtual disk; it does not by itself guarantee that the guest operating system will boot on different virtual hardware.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Copying or moving the disk
VirtualBox assigns UUIDs to virtual disk images and cautions against simply importing duplicate copies. If you need to reuse or move disks, use VirtualBox’s supported media-management workflow. If you are moving a complete VM, Oracle points to VirtualBox import/export rather than treating the disk as the whole machine.
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