Under the Storage Tree section, highlight Controller:IDE and then click on the “Add Hard Disk” icon to the right. In the VirtualBox main window, select your target virtual machine and click Settings. If not, VirtualBox will fail to boot from the USB drive.
Now open up the VirtualBox with administrative rights. This command creates a virtual machine disk (VMDK) file that points to the physical USB drive. 
You can replace C:\extusb.vmdk with any file path you want. VBoxManage internalcommands createrawvmdk -filename C:\exusb.vmdk -rawdisk \\.\PhysicalDrive#
Enter the following command while replacing # with the actual disk number you found above. If you have installed VirtualBox in any other directory or drive, then change the command accordingly. 
Use the cd command to navigate to VirtualBox’s installation directory.
Once you have the disk number, open up the Command Prompt as administrator. In my case, the USB drive is listed as “ Disk 1“, so the disk number is 1. Locate your USB drive and note its disk number. Press Windows Key + R to bring up the Run box, type diskmgmt.msc and press Enter to open the Disk Management window. 
Now we need to find the disk number of your physical USB drive.
Before doing anything, make sure you’ve created a bootable USB drive and plugged it into your computer. How to Boot An Existing VirtualBox VM from USB Drive? When you boot your virtual machine from the newly-created virtual hard drive, it will load the operating system on your USB stick. Just create a new virtual hard disk (VMDK) file and use it as a raw disk that VirtualBox maps to your USB drive. Luckily there is a workaround to boot a VirtualBox virtual machine from USB drive. How can I get a VirtualBox virtual machine to boot from a physical USB drive? The problem is that the GUI of Oracle VirtualBox does not have an option to set boot from USB.
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