If you're creating the VM from scratch, you may use raw file-backed disk image along with VMDK format wrapper. You may create a sparse file
# truncate -s 2G img
or a preallocated one
# dd if=/dev/zero of=img bs=1m count=2048
Then create a character device for it:
# mdconfig -a -t vnode -f img -u 4
Wrap it with a vmdk container
# VBoxManage internalcommands createrawvmdk -filename Img.vmdk -rawdisk /dev/md4
After that you may use Img.vmdk as any other disk image in VirtualBox, and mount /dev/md4* from the host machine. Just remember you'll need to run mdconfig after reboot, the md* devices are not preserved magically, and umount /dev/md4* before starting VBox.
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