Difference between revisions of "QCOW Image Format"

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(Created page with "QEMU uses the '''QEMU Copy-On-Write (QCOW)''' files to store a disk image. == MIME types == == File signature == QCOW files start with hexadecimal: 0x51 0x46 0x49 0xfb (ASC...")
 
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== File types ==
 
== File types ==
 +
Currently there two are versions of the QCOW format; version 1 and 2. Version 2 is the preferred format.
  
 
== Contents ==
 
== Contents ==
The QCOW format is used to store a disk image.
+
The QCOW format is used to store storage media data, e.g. disk images.
 +
 
 +
The QCOW image file consists of:
 +
* the file header
 +
* the L1 table (cluster aligned)
 +
* the reference count table (cluster aligned)
 +
* reference count blocks
 +
* snapshot headers (8-byte aligned on cluster boundary)
 +
* clusters containing:
 +
** L2 tables
 +
** storage media data
 +
 
 +
The clusters are 512 bytes of size
  
 
== Encryption ==
 
== Encryption ==
 
The QCOW2 format supports optional AES encryption
 
The QCOW2 format supports optional AES encryption
  
== See also==
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== See Also ==
 +
* [[Disk Images]]
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 +
== External Links ==
  
* [http://people.gnome.org/~markmc/qcow-image-format-version-1.html The QCOW Image Format]
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* [http://people.gnome.org/~markmc/qcow-image-format-version-1.html The QCOW Image Format], by [[Mark McLoughlin]], June 2006
* [http://people.gnome.org/~markmc/qcow-image-format.html The QCOW2 Image Format]
+
* [http://people.gnome.org/~markmc/qcow-image-format.html The QCOW2 Image Format], by [[Mark McLoughlin]], September 2008
  
 
[[Category:File Formats]]
 
[[Category:File Formats]]

Revision as of 00:45, 28 September 2012

QEMU uses the QEMU Copy-On-Write (QCOW) files to store a disk image.

MIME types

File signature

QCOW files start with hexadecimal: 0x51 0x46 0x49 0xfb (ASCII: "QFI.")

File types

Currently there two are versions of the QCOW format; version 1 and 2. Version 2 is the preferred format.

Contents

The QCOW format is used to store storage media data, e.g. disk images.

The QCOW image file consists of:

  • the file header
  • the L1 table (cluster aligned)
  • the reference count table (cluster aligned)
  • reference count blocks
  • snapshot headers (8-byte aligned on cluster boundary)
  • clusters containing:
    • L2 tables
    • storage media data

The clusters are 512 bytes of size

Encryption

The QCOW2 format supports optional AES encryption

See Also

External Links