0395: Compact VirtualBox VM .vdi Disk Size
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Compact VirtualBox VM .vdi Disk Size</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<script type="text/javascript" src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
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<script type="text/javascript">
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$(function(){
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theTextarea.height((theTextarea[0].scrollHeight-5) +'px');
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</script>
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<link href="css/steps.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<div id="gridContainer">
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<div class="topMargin"></div>
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<div id="listName" class="topMargin">
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<h1>Compact VirtualBox VM .vdi Disk Size</h1>
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</div>
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<div></div>
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<div id="content">
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<p><em>NOTE: This process only works on dynamically allocated virtual disks. If you're not sure, launch VirtualBox and go to File > Virtual Media Manager. Select the virtual drive and view the properties</em></p>
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<p>Create backups of virtual disks before attempting these steps</p>
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<h2>Compacting Windows Guest VM</h2>
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<ol>
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<li>Launch the Windows VM</li>
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<li>Inside the VM, launch a web browser and download the sdelete utility <a href="https://technet.microsoft.com/en-us/sysinternals/bb897443" target="_blank">Download</a></li>
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<li>Extract the downloaded sdelete .zip file</li>
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<li>Copy sdelete.exe for 32-bit OS or sdelete64.exe for 64-bit OS to the C:\Windows directory</li>
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<li>Launch Command Prompt by right clicking the Start button > Run > type cmd > Press Enter</li>
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<li>Run the following command to zero out the free space on the disk, replace the drive letter to target additional drives
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<div class="codeBlock">sdelete64.exe c: -z</div>
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</li>
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<li>Once the process completes, shutdown the VM</li>
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</ol>
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<h2>Compacting Linux Guest VM</h2>
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<ol>
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<li>Download the SystemRescue live disc <a href="https://www.system-rescue.org/Download/" target="_blank">Download</a></li>
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<li>Launch VirtualBox Manager</li>
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<li>Right click the VM to be compacted > Settings</li>
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<li>Select Storage on the left hand side</li>
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<li>Select the optical disc drive</li>
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<li>Click the disk selection icon > Choose a disk file...</li>
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<li>Navigate to the downloaded SystemRescue .iso file</li>
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<li>Click Open and OK to close the settings</li>
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<li>Right click the VM > Start > Normal Start</li>
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<li>Press Enter to boot SystemRescue using default options</li>
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<li>Once SystemRescue has finished booting, run the following commands
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<div class="codeBlock"># list the attached disks<br />
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fdisk -l<br />
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# find the disk to be compacted<br />
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# usually listed as /dev/mapper/....<br />
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# run the following, replacing the drive identifier as needed<br />
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zerofree -v /dev/mapper/<br />
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# after zerofree completes, shutdown the VM<br />
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shutdown now</div>
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</li>
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<li>Go back into the VM settings and remove the attached SystemRescue .iso</li>
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</ol>
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<h2>Compacting the Virtual Disk</h2>
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<ol>
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<li>Launch VirtualBox Manager on the host device</li>
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<li>Right click the VM to be compacted > Show in Explorer</li>
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<li>Right click in the white space > Open PowerShell window here...</li>
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<li>Run the following command, replacing the file name of the virtual disk
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<div class="codeBlock">"%programfiles%\Oracle\VirtualBox\vboxmanage.exe" modifymedium disk "name_of_disk.vdi" --compact</div>
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</li>
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</ol>
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</div>
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</div>
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</body>
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</html>
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