Resize VirtualBox VDI or VHD File on Mac OS

Check tutorial of How to Resize a VirtualBox VDI or VHD File on Mac OS X

So after a lot of requests from our users here is a guide about How to Resize a VirtualBox VDI or VHD File on Mac OS X.

If you are using VirtualBox to run guest operating systems within a virtual machine on the Mac, such as Windows 10 or Ubuntu Linux, you may need to change the size of the virtual disk where the operating system resides. This is often the case when you are underestimating how much space is needed for a correct installation on a virtual machine with dynamically allocated storage.

To resize a VDI or VHD file in Mac OS X (this can work the same in linux, let us know), use the VBoxManage tool from the Mac command line. Even if you choose to install VirtualBox’s command line tools, it won’t be in your path, so you go to the content of VirtualBox.app to use the utility instead.

Since this changes the virtual machine, it’s a good idea to go back up the VDI or VHD file beforehand, if you’re not comfortable with the terminal at all, you should probably go back up first the whole Mac. Note that the resizing tool uses megabytes for measuring, so if you change a vm file to 30 GB, it will be 30000 MB, 50 GB as 50000, and so on.

How to Resize a VirtualBox virtual disk in Mac OS

  1. Shut down the VM and shut down VirtualBox
  2. Open the Terminal app and use the following command to navigate to the VirtualBox app folder:
  3. cd /Applications/VirtualBox.app/Contents/Resources/VirtualBoxVM.app/Contents/MacOS/

  4. Now in the correct directory you are ready to run the resize command with the following syntax:
  5. VBoxManage change hd – change format For example, let’s say there is a Windows 10 VM VDI file at /Users/Paul/Documents/VM/Windows10.vdi and we want it to grow from 15 GB to 30 GB, the syntax would be: change VBoxManage hd –resize 30000 ~ / Documents /VM/Windows10.vdi

  6. Optionally, verify that the change was made with the showhdinfo command:
  7. VBoxManage showhdinfo ~ / path / to / vmdrive.vdi

  8. Restart VirtualBox and boot your newly scaled down guest operating system

If the path to the VM file is in a deep-seated or complex location, use quotation marks or use drag and drop to print the path trick which works great in the Terminal app to correctly reference a complex directory hierarchy.

Resizing the drive with VBoxManage is basically instant from the command line, but keep in mind that once you get back to the virtual operating system (Windows, OS X, Linux or whatever you have running in VirtualBox) want to reassign the partition to use the new space.

VirtualBox manager

I ran this to increase a minimum dynamic allocation size. If the VDI file is a fixed size and you want to shrink it, the VBoxManage tool will still do the job, but the -compact flag is what you’re looking for.

VBoxManage is a handy tool with many great uses, you can also use it to quickly clone a virtual disk and modify almost everything in VirtualBox from the command line. If you plan to use VBoxManage often, you may want to add it to your path or create an alias for easier access.

Do you know of any other way to resize a VirtualBox VDI? Let us know in the comments.

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How to Resize a VirtualBox VDI or VHD File on Mac OS X: FAQ

Tutorial Summary: How to Resize a VirtualBox VDI or VHD File on Mac OS X


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What is actual time in which this method complete?


The time to complete the How to Resize a VirtualBox VDI or VHD File on Mac OS X tutorial is 10+ minutes.

What are the supported Device?


Apple

What are the supported Operating system?


mac OS



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