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Booting OS/Ubuntu from an external Hard disk uisng Virtual Box virtual harddrive feature

First you need to boot from the hard drive

For that put the harddrive in an hardrive enclosure and connect it via usb to your host OS

Then follow the steps in the Virtual box help guide

9.9.1. Access to entire physical hard disk
While this variant is the simplest to set up, you must be aware that this will give a guest operating system direct and full access to an entire physical disk. If your host operating system is also booted from this disk, please take special care to not access the partition from the guest at all. On the positive side, the physical disk can be repartitioned in arbitrary ways without having to recreate the image file that gives access to the raw disk.

To create an image that represents an entire physical hard disk (which will not contain any actual data, as this will all be stored on the physical disk), on a Linux host, use the command

VBoxManage internalcommands createrawvmdk -filename /path/to/file.vmdk
-rawdisk /dev/sda
This creates the image /path/to/…