[Mark Grant]

Actually, 300-400MB should be just enough for a twenty minute race, but if you have the space, you might want to put it higher, to be on the safe side...

Thanks for this Robin.
Actually, since posting the thread, I discovered I can use the ingame replays for different camera views, and record using Nvidia Geforce Experience to create an mp4 file. I have been able to view the incident at Spa from different angles, including incar of the 'culprit'. It's very impressive what can be done with sim racing :-)