# Virtual Machine Disk

> virtual hard drive format introduced by VMware

**Wikidata**: [Q2658179](https://www.wikidata.org/wiki/Q2658179)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/VMDK)  
**Source**: https://4ort.xyz/entity/virtual-machine-disk

## Summary
Virtual Machine Disk (VMDK) is a virtual hard drive format introduced by VMware. It functions as a disk image file that contains the contents and structure of a disk volume, allowing for the virtualization of storage resources.

## Key Facts
*   **Developer:** VMware
*   **File Extension:** .vmdk
*   **Classification:** Instance of a disk image
*   **Aliases:** VMDK
*   **Media Types:** application/x-vmdk-disk and application/x-virtualbox-vmdk (both unofficial)
*   **Wikipedia Title:** VMDK
*   **Wolfram Language Entity Code:** Entity["FileFormat", "VMDK-1"]
*   **Technical Documentation:** Described at url `https://www.vmware.com/support/developer/vddk/vmdk_50_technote.pdf`

## FAQs
### Q: Who developed the Virtual Machine Disk format?
A: The Virtual Machine Disk format was developed by VMware.

### Q: What file extension is used for Virtual Machine Disks?
A: The file extension used for this format is .vmdk.

### Q: What type of file is a Virtual Machine Disk classified as?
A: It is classified as a disk image, which is a computer file containing the contents and structure of a disk volume.

## Why It Matters
The Virtual Machine Disk (VMDK) format is a fundamental component in the field of virtualization, introduced by VMware to facilitate the operation of virtual machines. As a specific implementation of a disk image, it solves the problem of how to store and manage the contents of a hard drive within a virtual environment. By encapsulating the structure and data of a disk volume into a single file, VMDK allows virtual machines to function as if they had physical hard drives.

This format is significant because it enables the portability and management of virtualized workloads. The existence of specific media types (such as `application/x-vmdk-disk`) and its recognition in programming environments like Wolfram Language highlight its established role in computing. It serves as the storage backbone for systems running on VMware infrastructure, allowing for the abstraction of physical hardware resources into flexible, manageable digital assets.

## Notable For
*   Being the virtual hard drive format introduced by VMware.
*   Serving as a container for the contents and structure of a disk volume.
*   Recognition under unofficial media types such as `application/x-virtualbox-vmdk`.
*   Inclusion in the Kaitai Struct format gallery (ID: `vmware_vmdk`).
*   Having a dedicated entity code in the Wolfram Language (`VMDK-1`).

## Body
### Technical Specifications
The Virtual Machine Disk format utilizes the file extension **.vmdk**. It is structurally defined as a disk image, meaning it replicates the contents and structure of a disk volume. The format is associated with specific media types, specifically `application/x-vmdk-disk` and `application/x-virtualbox-vmdk`, though these are currently designated as unofficial according to shared-mime-info records.

### Developer and Resources
VMware is the developer and primary authority for this format. Technical resources and interface documentation are hosted at `vmware.com`, with a specific technical note available at the provided description URL. The format holds the Freebase ID `/m/04f6yrg` and is categorized as a Quora Topic under "VMDK."

### Digital Identifiers
The format is indexed across various knowledge bases and technical libraries:
*   **Wikidata:** Description matches the definition of a virtual hard drive format introduced by VMware.
*   **Wikipedia:** Titled "VMDK," with articles available in 8 languages including English, Spanish, French, Italian, Portuguese, Russian, Simple English, and Chinese.
*   **Wolfram Language:** Identified by the code `Entity["FileFormat", "VMDK-1"]`.
*   **Kaitai Struct:** Listed with the gallery ID `vmware_vmdk`.

## References

1. Freebase Data Dumps. 2013
2. [Source](https://gitlab.freedesktop.org/xdg/shared-mime-info/-/blob/2.3/data/freedesktop.org.xml.in#L8052-8062)
3. Quora