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VHD (Virtual Hard Disk) file format

.vhd · .vhdx  ·  virtual disk image  ·  introduced 2003 by Connectix / Microsoft

What is a VHD (Virtual Hard Disk) file?

VHD and the newer VHDX are Microsoft virtual hard disk formats used by Hyper-V and Windows itself for native virtual disk mounting. VHDX supports up to 64 TB, online resizing, and corruption protection. Windows can mount a VHDX as a drive letter with a double-click in Disk Management.

Most readers reach this page after double-clicking a .vhd file and finding their operating system unsure what to do with it. The good news: VHD (Virtual Hard Disk) is a well-understood format with mature tooling on every major platform. It is supported in one click by mainstream archivers on Windows, macOS, and Linux.

How to extract a VHD (Virtual Hard Disk) file

Opening a .vhd file is straightforward on every modern operating system. The exact steps depend on which platform you are on:

On Windows

  1. Locate the .vhd file in File Explorer.
  2. Right-click the file. If you have 7-Zip installed, choose 7-Zip → Extract Here. On Windows 11 the built-in extractor handles ZIP, 7z, RAR and several other formats directly through Extract All…
  3. If prompted, pick a destination folder and click Extract.
  4. The extracted files appear in a folder next to the original archive.

On macOS

  1. Find the .vhd file in Finder.
  2. Install The Unarchiver from the Mac App Store, or Keka for both creating and extracting.
  3. Right-click the file → Open With → The Unarchiver (or just double-click after Unarchiver is set as the default).
  4. The extracted folder appears next to the archive.

On Linux

  1. Use your file manager: right-click the archive → Extract Here (file-roller on GNOME, Ark on KDE).
  2. On the command line, run one of: 
    7z x archive.vhd    # works for almost any format
  3. The files appear in the current directory.

How to create a VHD (Virtual Hard Disk) file

To pack files into a .vhd archive, you typically need an archiver that supports writing this format. Not every tool can create every format — for example, only WinRAR can create real RAR files. The sidebar lists the software known to read and write VHD (Virtual Hard Disk).

On the command line, the canonical create command is:

# Use 7-Zip, PeaZip, or the format's reference tool to create .vhd files.

If you regularly create archives at scale, a dedicated archive automation suite can wrap this command in scheduled jobs, integrity checks, and offsite replication.

Strengths

  • Native Windows support
  • Sparse allocation
  • Differencing disks

Weaknesses and limitations

  • Less popular than VMDK/QCOW2 outside Windows
  • Tools outside Hyper-V are limited

Typical use cases

  • Hyper-V virtual machines
  • Native boot from VHDX
  • Windows backup snapshots

Technical details

VHD (Virtual Hard Disk) uses the Sparse / fixed / differencing algorithm and is identified on disk by the magic byte sequence conectix (VHD footer) / vhdxfile (VHDX). The standard MIME type is application/x-virtualbox-vhd. The format is an open specification and is free for any use.

Frequently asked questions

Is VHD (Virtual Hard Disk) safe to open?

Archive files are containers — they are only as safe as what they contain. A .vhd from a trusted source is fine; one received from a stranger can hold malicious executables, scripts, or files engineered to exploit bugs in your archiver. Always keep your archiver updated, and never run unknown executables that come out of an archive. A safe workflow is to extract into a sandbox and scan the contents before opening anything.

What is the maximum file size?

Modern implementations support archives in the multi-terabyte range. The practical limit is your filesystem (FAT32 caps at 4 GB; ext4, NTFS, APFS, and exFAT all comfortably handle multi-TB files).

Can I password-protect a VHD (Virtual Hard Disk)?

Some archivers can wrap VHD (Virtual Hard Disk) files in an encrypted container, but the format itself does not always include built-in encryption. Check your archiver's documentation.

How does VHD (Virtual Hard Disk) compare to other formats?

See our format comparison pages such as ZIP vs 7z, ZIP vs RAR, and tar.gz vs tar.xz for side-by-side feature tables.

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