This tutorial applies to Virtualbox when Windows is the host and Linux is the VM guest.


  • Windows 10 host
  • Virtualbox
  • Ubuntu Linux guest or
  • Fedora Linux guest

You also need to download the ISO file from Gparted. You can download it from here. This file is about 200MB. It should take 1-10m depending on your Internet speed.

The file might say gparted live i686.iso.

Video Tutorial

Backup the VDI file

Open Virtualbox.

The Virtual Machine should NOT be running. If it’s running just shut it down.

Right click the Virtual Machine. Then Settings.

Go to Storage.

Under Controller: SATA. Click on the .vdi file.

On the right there is a field that says Location. Copy/paste this somewhere (Sublime)

In my case this location is:

C:\Users\neo\VirtualBox VMs\Ubuntu\Ubuntu.vdi

Open that folder.

Copy paste the vdi file to another location. Perhaps Downloads. You can use this as a backup in case you mess something up :)

Resize the VDI file

Close VirtualBox

We are going to resize the current vdi file. NOT the backup.

Open the command prompt.

If you go to the Windows search and type command you should find it.

Go to this directory:

cd C:\Program Files\Oracle\VirtualBox

You have to resize the file in MBs. Get your calculator.

Let’s say that your current file is 10GBs.

You want to resize it to 20GBs?

Calculate 1024 * 20.

The result is 20480.

You are going to need this number and the location of your vdi file.

Go to the command prompt and follow this formula:

VBoxManage modifyhd "Location" --resize RESULT

In my case:

  • Location: C:\Users\neo\VirtualBox VMs\Ubuntu\Ubuntu.vdi
  • Result: 20480

The command should be:

VBoxManage modifyhd "C:\Users\neo\VirtualBox VMs\Ubuntu\Ubuntu.vdi" --resize 20480

It should show an output such as:


Then go back to the prompt. You can close the prompt for now.

Open VirtualBox. Select the VM but don’t start it. On the Preview specs on the right side. Look at Storage. Under Controller: SATA it should have changed the size of the storage drive.

In my case it would say 20GB. (It used to say 10GB).

Load Gparted

Go back to VirtualBox. Right click on the VM. Then Settings.

Go to Storage.

Click on Controller: IDE.

If this is not listed. You could create one. There is a little Plus icon towards the bottom of this window. Actually there are 2 icons. The one closest to the right is a tilted square. Click on this. There is an option to Add IDE Controller.

Once you click on Controller: IDE.

Click on the Plus icon that is closest to the left. Click the option Add Optical Drive.

On the popup box, click on Choose disk.

Find the Gparted iso file that you downloaded previously.

Then click Open.

Click on this drive.

On the right side choose these options:

  • Optical Drive: IDE Primary Master
  • Live CD: Checked.

Click OK to save. And close the settings window.

Resize the Partition with Gparted

Start the VM.

It should load Gparted.

There are a few options when it starts. Just hit Enter to everything until you login to what it looks like a Linux VM.

By default it starts Gparted automatically.

The screen should show 3 partitions:

  • /dev/sda1: root
  • /dev/sda2: swap
  • unallocated

In my example my original storage drive was 10GB and I resized it to 20GB.

You will see that:

  • /dev/sda1 size is 6GB
  • /dev/sda2 size is 4GB

If you setup the VM with 4GB of RAM. Well this used by a swap partition. In this case /dev/sda2.

All your files should be in the root partition.

But you will see that the unallocated partition is on the opposite side of root with swap in the middle.

In other words. You need to resize root but swap is on the way.

We need to delete swap. Resize root to the unallocated side. Type in the swap size again. And build a new swap partition.

Follow these steps. Thanks to this source:

  1. Right click the swap partition
  2. Click on Swapoff. (if this option is not there, continue)
  3. Right click the swap partition and Click on Delete
  4. On the top menu. Click the Apply.
  5. Right click on the Extended file system that had the swap partition and delete it.
  6. Right click on the root partition /dev/sda1.
  7. Use the mouse to drag and resize to take all the unallocated space.
  8. Inside the field Free space following enter the size of the swap partition. In my example this is 4GB. So type 4096.
  9. Hit tab to see how it auto-resizes the total. Click Save or OK.

Let’s create the swap partition again.

  • Right click unallocated.
  • Select extended partition. Click OK
  • Right click on this new partition.
  • In File system. Select linux-swap. Click OK
  • On the top menu select Apply.
  • Right click on the swap partition and hit swapon.

Quit Gparted. File, exit.

Then on the desktop, hit the red turn off button.

When shutting down, it might say to remove the CD and hit Enter. Do that.

It might take 5m for this to turn off.

Change Gparted settings

Right click on the VM, then Settings.

Go to Storage.

Under Controller: IDE select gparted.

Set the Optical Drive to IDE Secondary Master or IDE Secondary Slave.

Uncheck Live CD.

Click OK.

Start the VM

We should be good now.

Start the VM and it should start as usual. Verify that all files remain there.