You can convert a physical disk directly to a VDI without creating an intermediate raw image file first (saving time and space).

In 2009, (then already part of Microsoft) released a tiny utility: disk2vdi . Its creator? Mark Russinovich , the legendary OS internals expert.

But under the hood lay deep magic:

Disk2vhd is the industry standard for "Physical-to-Virtual" (P2V) migrations on Windows systems.

: It can create .VHD files (legacy) or .VHDX files (modern), which support larger capacities and better power-failure resilience.

: Use the Disk2vhd tool from Microsoft Sysinternals to create a virtual image of your physical drive. Attach or Convert :

In the virtualization pantheon — next to VMware Converter, Clonezilla, and StarWind V2V — disk2vdi sits quietly, respected by graybeards, discovered by newbies, and forever useful.

| Feature | Switch / Flag | Utility Benefit | | :--- | :--- | :--- | | | --variant Standard | Creates a dynamically expanding image. It only consumes space on the host disk that is actually used by data inside the VM. | | Fixed Size | --variant Fixed | Creates a fixed-size disk. Offers slightly better I/O performance but consumes full host space immediately. | | UUID Handling | --uuid | Allows you to assign a specific UUID to the new VDI, useful if you are replacing a failed virtual disk in an existing VM configuration. |

disk2vdi has no splashy UI, no marketing team. It’s just a window with drive letters and checkboxes. But inside that tiny executable lives a deep understanding of Windows internals: VSS, NTFS, boot managers, partition tables, and the fragile dance of moving a digital soul from metal to file.

Before converting a Windows physical machine to a VDI, performing these steps ensures the VM will actually boot: