I replied to a post saying that nobody had a 20GB system. Sure it was more of a mid to high-end thing, but very much far from nobody.
And I was there too, the low end cheapo PC I got that year had 12GB.
https://vintageapple.org/pcworld/pdf/PC_World_9912_December_1999.pdf
And by 2001 that 12GB got an 80GB companion. Sure, 20GB was some low-end baseline maybe, but I had 12+80 by that year and it was in no way unusual.
Edit: and just checked the Wayback Machine for the local computer shop. The cheapest Celerons had 40GB. In 2001.