If NOTHING is written to the hard disk how can Windows see anything different when it boots up, irrespective of whether Knoppix unmountd the drive or not? Why does it not see what it saw before and boot up as before?

I find this experience a little worrying. We are told Knoppix is safe because NOTHING is written to the hard disk. Yet it would appear there is more than one isolated case where a problem appears to have occurred.

ICPUG