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informatique:virtualbox [28/08/2016 12:06] – [Virtualbox] cyrilleinformatique:virtualbox [14/09/2018 16:34] (Version actuelle) – [modifyhd] add SDelete url cyrille
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 ==== modifyhd ==== ==== modifyhd ====
  
-With the **--compact** option, can be used to compact disk images, i.e. remove blocks that only contains zeroes. This will shrink a dynamically expanding image again; it will reduce the physical size of the image without affecting the logical size of the virtual disk. Compaction works both for base images and for diff images created as part of a snapshot.+With the **compact** option, can be used to compact disk images, i.e. remove blocks that only contains zeroes. This will shrink a dynamically expanding image again; it will reduce the physical size of the image without affecting the logical size of the virtual disk. Compaction works both for base images and for diff images created as part of a snapshot.
  
 For this operation to be effective, it is required that free space in the guest system first be zeroed out using a suitable software tool. For Windows guests, you can use the sdelete tool provided by Microsoft. Execute **sdelete -z** (faster than -c) in the guest to zero the free disk space before compressing the virtual disk image. For this operation to be effective, it is required that free space in the guest system first be zeroed out using a suitable software tool. For Windows guests, you can use the sdelete tool provided by Microsoft. Execute **sdelete -z** (faster than -c) in the guest to zero the free disk space before compressing the virtual disk image.
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 Please note that compacting is currently only available for VDI images. A similar effect can be achieved by zeroing out free blocks and then cloning the disk to any other dynamically expanding format. You can use this workaround until compacting is also supported for disk formats other than VDI. Please note that compacting is currently only available for VDI images. A similar effect can be achieved by zeroing out free blocks and then cloning the disk to any other dynamically expanding format. You can use this workaround until compacting is also supported for disk formats other than VDI.
  
 +  * [[https://docs.microsoft.com/en-us/sysinternals/downloads/sdelete|SDelete]] chez microsoft.com
   * [[http://technet.microsoft.com/fr-fr/sysinternals/bb897443.aspx|SDelete v1.51]]   * [[http://technet.microsoft.com/fr-fr/sysinternals/bb897443.aspx|SDelete v1.51]]
   * [[http://download.cnet.com/SDelete/3000-2092_4-95740.html|SDelete v1.6]]   * [[http://download.cnet.com/SDelete/3000-2092_4-95740.html|SDelete v1.6]]
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 ==== sethduuid ==== ==== sethduuid ====
informatique/virtualbox.txt · Dernière modification : 14/09/2018 16:34 de cyrille

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