How to compress VirtualBox image

So far what I can achieve is the image file size same as the usage for the virtual machine, for example, if you partition your c drive as 50GB and you have used 40GB then your file size should not get more than 40GB. If you image file size is larger than that then you can do the following.

1. Do a Disk Cleanup in your drive.


2. Do a defragment by issuing the command defrag c: /u /v in command prompt (assuming the drive is c).

3. Download sysinternals from

4. Run sdelete -z in command prompt. DO NOT run sdelete -c.

If you are run sdelete using -c like this article mentioned,, then your disk size will epand to the maximum.

5. Shutdown your virtual machine.

6. Run VBoxManage.exe YourImageName.vdi –compact in command prompt (for example, your image name is YourImageName.vdi).

Your disk size should be good by now.

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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