Do not act on this article unless you are prepared to trash your disks, or if you are absolutely sure you understand what you are doing. Messing with raw disk sectors is risky!
VirtualBox allows us to use a disk device directly, rather than using a file as a virtual volume. For me, since I have two SSDs in my laptop, it meant I could tinker with virtual machines without risking my Windows 7 partition, while also being able to boot the VMs on real hardware if I wanted.
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