How To Increase VirtualBox’s Disk Space

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_MB

replacing YOUR_HARD_DISK and SIZE_IN_MB with your Hard Disk name and desired size.
Like,

VBoxManage modifyhd D:\VB\Win10\win10.0.vdi --resize 20480

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