Quote:
I have no idea as to what sizes are out there.


Last I heard (which was a while ago), 20Gb was the largest available. The thing that you have to remember is that for fitted extras, the car manufacturer often has to be able to guarantee reliable operation for 3 to 5 years, and compatible replacement parts to be available for 10 to 15 years after that.

This tends to make them a little bit conservative.
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-- roger