My first HD was 32MB and cost $360us.
At $30 a megabyte that is a lot of space.
A little earlier: The first I used was $120 a MB. The 10MB harddrives for LT Colonel was $1200 in the late 1980s
So, 750MB back then would be around $90,000 dollars at $120 a MB
Earlier still: Remember LISA from Apple? It had 1MB of memory and that cost $3000 dollars.
Then, a 750MB of memory (Not nessisarily HD, but RAM) would have cost $2,250,000 Million.
The thing is imagine READING through 750MB of TEXT with only 4 letters and trying to find particularities.
Or printing it!