linux
su -
VBoxManage internalcommands createrawvmdk -filename /home/username/usb.vmdk -rawdisk //./dev/sdc
chown username:username /home/username/usb.vmdk
chmod 777 /dev/sdc

windows
VBoxManage internalcommands createrawvmdk -filename c:\usb.vmdk -rawdisk \\.\PhysicalDrive1 -register
"C:\Program Files\qemu\qemu-system-i386.exe" -m 600 -usb \\.\PhysicalDrive1

su -
chmod 777 /dev/sdc
qemu-system-i386 -m 600 -usb /dev/sdc
qemu-system-x86_64 -m 600 -usb /dev/sdc

qemu-system-i386 -m 600 -cdrom /dev/cdrom -boot d -net nic -net user -m 196 -localtime
qemu-system-i386 -m 600 -cdrom /path/file.iso
