Ha ha, a 20MB hard drive. It must be inconceivable to anyone under 30 how such a thing could possibly be useful.
When I ran my (very successful) BBS in California, I used a portable PC with no hard drives, simply a 512K RAM drive in non-volatile memory. When one of our out-of-state callers offered to send me a 10MB (not even 20!) drive, we were delighted, and could only imagine the ways we could expand the forum.
A week later, the doorbell rang. It was the UPS guy with the hard drive. Unfortunately, he was more interested in getting me to sign for the delivery than safely delivering it—and when he carelessly handed me the package, he dropped it. Clang!! Naively, I accepted it anyway, then found it was DOA when I connected it. The sender hadn't bother to insure it, so there was no point in filing a damage claim.
Anyway, that's right, folks: a whole hard drive that holds 20MB. Or even 10MB. That was computing history.