Difference between revisions of "Virtual Hard Disk (VHD)"

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The Virtual Hard Disk (VHD) commonly uses the .vhd extension.
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This format is used to store virtual disk images by:
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* Microsoft Virtual PC
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* Microsoft Virtual Server
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* Microsoft Hyper-V Server
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VHD support is also integrated into [[Windows]] (at least in Windows 7) where "Disk Management" (part of "Computer Management") supports attaching and creating Fixed and Dynamic VHD image files.
  
 
== Image types ==
 
== Image types ==
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* Fixed-size hard disk image; the image contains all data
 
* Fixed-size hard disk image; the image contains all data
 
* Dynamic-size (or sparse) hard disk image; the image contains used data only
 
* Dynamic-size (or sparse) hard disk image; the image contains used data only
* Differencing (or delta) hard disk image; the image contains changes relative to its parent image
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* Differential (or differencing, or delta) hard disk image; the image contains changes relative to its parent image
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== Snapshots ==
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Hyper-V has functionality to create snapshots.
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These snapshots are stored in Snapshot Differencing Disk (AVHD) files which commonly uses the .avhd extension.
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The snapshot can be interdependent on one-another, because they are differential images of the previous snapshot.
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== See Also ==
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* [[Disk Images]]
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* [[Windows]]
  
 
== External Links ==
 
== External Links ==
  
 
* [http://en.wikipedia.org/wiki/VHD_(file_format) VHD (file format)], by Wikipedia
 
* [http://en.wikipedia.org/wiki/VHD_(file_format) VHD (file format)], by Wikipedia
* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft
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* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft, October 2006
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* [http://code.google.com/p/libvhdi/downloads/detail?name=Virtual%20Hard%20Disk%20%28VHD%29%20image%20format.pdf Virtual Hard Disk (VHD) image format], by the [[libvhdi|libvhdi project]], September 2012
  
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=== Snapshots ===
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* [http://social.technet.microsoft.com/wiki/contents/articles/670.hyper-v-concepts-snapshots.aspx Hyper-V Concepts - Snapshots]
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* [http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/03/11/virtual-machine-snapshotting-under-hyper-v.aspx Virtual Machine Snapshotting under Hyper-V]
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* [http://www.msserveradmin.com/hyper-v-snapshot-files-avhd-and-vhd-what-the/ Hyper-V SnapShot Files – AVHD and VHD? What The ?]
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* [http://social.technet.microsoft.com/wiki/contents/articles/6257.manually-merge-avhd-to-vhd-in-hyper-v.aspx Manually Merge .avhd to .vhd in Hyper-V]
  
 
[[Category:File Formats]]
 
[[Category:File Formats]]

Revision as of 00:40, 20 September 2012

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Further information might be found on the discussion page.

The Virtual Hard Disk (VHD) commonly uses the .vhd extension.

This format is used to store virtual disk images by:

  • Microsoft Virtual PC
  • Microsoft Virtual Server
  • Microsoft Hyper-V Server

VHD support is also integrated into Windows (at least in Windows 7) where "Disk Management" (part of "Computer Management") supports attaching and creating Fixed and Dynamic VHD image files.

Image types

There are multiple types of Virtual Hard Disk (VHD) images:

  • Fixed-size hard disk image; the image contains all data
  • Dynamic-size (or sparse) hard disk image; the image contains used data only
  • Differential (or differencing, or delta) hard disk image; the image contains changes relative to its parent image

Snapshots

Hyper-V has functionality to create snapshots.

These snapshots are stored in Snapshot Differencing Disk (AVHD) files which commonly uses the .avhd extension.

The snapshot can be interdependent on one-another, because they are differential images of the previous snapshot.

See Also

External Links

Snapshots