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While I haven't done it with VirtualBox, I have been able to boot existing Ubuntu installs (partitions) on a physical hard disk using VMware Player. You have some initial fun getting the drivers straight in the VM, but it can work if the VM allows you direct access to a physical hard drive.
– irrational John
Commented Apr 15, 2012 at 0:42
1

FWIW, I took a quick glance at the VirtualBox documentation. Section 9.8.1 Using a raw host hard disk from a guest et seq. covers using VMware's VMDK VHDD format with a VirtualBox VM to allow the VM to directly access a physical hard disk attached to the host system. Obviously not something for the casual user, but it looks like it can be done.
– irrational John
Commented Apr 15, 2012 at 2:39

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