USB Drive As VHD?

[Microsuck]

I have a bootable flashdrive, with an operating system on it. It boots on my pc. I want to be able to use it in virtualbox as well, and sort of do now, but this invovles ripping an image of the flasdrive, making that into a vhd, then reversely, reflashing the drive with the image. This is if I want to make any changes to the flashdrive in virtualbox. I'd like to be able to boot the usb drive directly in virtualbox, as the vhd. Is this possible?

[mpack]

Only by mounting the drive as a raw disk (a very dangerous feature), as VirtualBox VMs can't boot from a USB drive.

[Microsuck]

Is it even possible to mount a physical hard drive as a VHD?

[noteirak]

AFAIK only VMDK allow you that.

[Perryg]

If you already have a "VHD" file you don't have a physical disk. You have a large file on the disk and it is called *.VHD.
All you need to do is create a guest in VirtualBox and tell it to use the VHD file. Other than that you use the raw image like mpack said and setup a raw disk in VirtualBox.
This requires expert level knowledge though and you will find very few that will want to help because it is so dangerous.