What is MIME type "application/x-virtualbox-vdi"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

application/x-virtualbox-vdi is a MIME type for files that hold a virtual machine’s disk image used in VirtualBox.
These disk images store an entire hard drive’s layout and data for virtualized environments.
They enable a virtual machine to mimic a physical computer’s storage system by containing the operating system, applications, and user files.

This format is created and used by VirtualBox.
It supports both dynamic and fixed disk allocations.
It ensures a controlled environment for testing and running multiple systems on one PC.

The related file extension is VDI.
For further details on VirtualBox and its disk image configurations, visit the VirtualBox Documentation.

Associated file extensions

.vdi

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/x-virtualbox-vdi

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/x-virtualbox-vdi">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'application/x-virtualbox-vdi');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.vdi

FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.