On a physical machine, using livecds ensures that the computer is safe because it's a read only medium. This also makes it optimum for privacy. In a virtual machine however, can this be done? Disabling the pagefile in this case seems imperative. But is this enough? Does caching to host I/O need to be disabled too? This assumes that the host is completely clean. The idea here is to prevent debris from the Guest session from being transferred to host at any given time.