VirtualBox: Use a host block device in the virtual machine

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http://www.linuxquestions.org – After rummaging through the VirtualBox Virtual Machine Settings -- trying to find out how to use a host device (in this case a USB flash drive) in a VirtualBox SAS controller -- in an endless loop, I feel hopeless. Here's my reason for the use of a system block device in a virtual machine: You see, this VM is a 64-bit VM designed to emulate a 64-bit system on a 32-bit processor. Why? Google Chrome OS won't build on 32-bit processors, so I decided to cross-virtualize to be able to support this. I obviously cannot write an image to a USB flash drive without access to the entire disk (/dev/sdc (HowTos)