The Short answer is that you can't do what you are trying to do unless you are using the Sony MZ-RH1, which was the last Hi-MD unit released by Sony and the only one which allows uploading of 'legacy' discs such as the ones you have been given.
You can of course connect your player to the line in of your computer and record in real time using something like Audacity, but that that could be a long job if you have a number of discs to transfer.