- Open a Command Prompt Window (Run as Administrator)
- Change to VirtualBox’s Program Files Folder
- Then type the code below in the Command Prompt.
VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize SIZE_IN_MBCOPYReplacing YOUR_HARD_DISK and SIZE_IN_MB with your Hard Disk name and desired size.
Example:
VBoxManage modifyhd D:\VB\Win10\win10.0.vdi --resize 20480