Increase disk size of VirtualBox Windows virtual machines

1. Shut down the VM if it is running;
2. On CLI, run:

VBoxManage modifyhd /directory/myWindowsVM.vdi –resize numberInMB

3. Start VM -> Manage Computer -> Disk Management
4. If you want to give the space to the existing drive, right click on said drive -> Extend Volume… and follow instructions
5. If you want to create a new drive, click on the new space, and do partition wizard, follow instructions.

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