The Osborne 1 didn't even have an HDD! You think HDs are slow, try 5 1/4" floppies for latency.

Anyway, SSDs soon. I will not be sorry to see the back of spinning magnetic media of any stripe.

x3,000,000 for me (ZX81 with 16 K RAM pack - but if I'd stuck with the standard 1K, it would be... x48,000,000).

One version of Moore's Law predicts x1000 increase in 15 years (x2 every 1.5 years; 2^10 = 1024).

48GB isn't standard today. The ordinary amount in an average desktop PC is about 2GB. Therefore, in 15 years (2024), we can expect ordinary, standard desktop PC to have 2TB RAM.