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

From ForensicsWiki
Jump to: navigation, search
(Snapshots)
 
(19 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
{{expand}}
 
{{expand}}
 +
 +
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 ==
 
== Image types ==
* Fixed-size hard disk image
+
There are multiple types of Virtual Hard Disk (VHD) images:
* Dynamic-size (or sparse) hard disk image
+
* Fixed-size hard disk image; the image contains all data
* Differencing hard disk image
+
* 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 ==
 +
* [[Disk Images]]
 +
* [[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
+
* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft, October 2006
 +
* [https://googledrive.com/host/0B3fBvzttpiiSY250RjRzRXQ0bDg/Virtual%20Hard%20Disk%20(VHD)%20image%20format.pdf Virtual Hard Disk (VHD) image format], by the [[libvhdi|libvhdi project]], September 2012
 +
 
 +
=== Snapshots ===
 +
* [http://social.technet.microsoft.com/wiki/contents/articles/670.hyper-v-concepts-snapshots.aspx Hyper-V Concepts - Snapshots]
 +
* [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]
 +
* [http://www.msserveradmin.com/hyper-v-snapshot-files-avhd-and-vhd-what-the/ Hyper-V SnapShot Files – AVHD and VHD? What The ?]
 +
* [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]
  
 +
== Tools ==
 +
* [[libvhdi]]
  
 
[[Category:File Formats]]
 
[[Category:File Formats]]

Latest revision as of 01:26, 15 July 2013

Information icon.png

Please help to improve this article by expanding it.
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

Tools