Difference between pages "QCOW Image Format" and "Virtual Hard Disk (VHD)"

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(Image types)
 
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[[QEMU]] uses the '''QEMU Copy-On-Write (QCOW)''' files to store a disk image.
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{{expand}}
  
== MIME types ==
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== Image types ==
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There are multiple types of Virtual Hard Disk (VHD) images:
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* Fixed-size hard disk image
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* Dynamic-size (or sparse) hard disk image
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* Differencing (or delta) hard disk image
  
== File signature ==
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== External Links ==
QCOW files start with hexadecimal: 0x51 0x46 0x49 0xfb (ASCII: "QFI.")
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== File types ==
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* [http://en.wikipedia.org/wiki/VHD_(file_format) VHD (file format)], by Wikipedia
Currently there two are versions of the QCOW format; version 1 and 2. Version 2 is the preferred format.
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* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft
 
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== Contents ==
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The QCOW format is used to store storage media data, e.g. disk images.
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The QCOW image file consists of:
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* the file header
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* the L1 table (cluster aligned)
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* the reference count table (cluster aligned)
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* reference count blocks
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* snapshot headers (8-byte aligned on cluster boundary)
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* clusters containing:
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** L2 tables
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** storage media data
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The clusters are 512 bytes of size
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== Encryption ==
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The QCOW2 format supports optional AES encryption
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== See Also ==
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* [[Disk Images]]
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== External Links ==
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* [http://people.gnome.org/~markmc/qcow-image-format-version-1.html The QCOW Image Format]
 
* [http://people.gnome.org/~markmc/qcow-image-format.html The QCOW2 Image Format]
 
  
 
[[Category:File Formats]]
 
[[Category:File Formats]]

Revision as of 04:01, 13 September 2012

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Image types

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

  • Fixed-size hard disk image
  • Dynamic-size (or sparse) hard disk image
  • Differencing (or delta) hard disk image

External Links