The LARGEST N64 game that I am aware of is 64MB - Conkers Bad Fur Day is one of those games. If you had a 512MB cart (if they made it) you would be set for at least 10 games. But I haven't seen one of these.
You will not find 64GB Flash memory for a N64 - I doubt it would even work that way.
A 2TB hard drive is only available in 3.5" hard drives and is about $200 right now.
The biggest laptop (2.5") hard drive I've seen was 640GB & to play games off of that, you would need a Mod Chip (which is frowned upon here?)
A laptop - even the ASUS EEEPC will not "lag" with N64 games. Most of the games work flawlessly. You could even play some Dreamcast games on there.
Dreamcast on EEE PC 901
http://www.youtube.com/watch?v=YnS0XrxONTs" onclick="window.open(this.href);return false;
Another Netbook running Emulators (N64, PS1, NES, Genesis, SNES)
http://www.youtube.com/watch?v=f2x7F5ln ... re=related" onclick="window.open(this.href);return false;
I'm definitely agree with the post above mine - figure out what it is that you want. But I don't see any of your ideas working practically.