Round about 1992 I was working on a project that would see the introduction of the company's first DB2 database.
I did all the analysis and designed the database so that we could do what we intended with it, then worked out the storage requirements, which came in at around 13 gigabytes to which we added a 2 gigabyte contingency.
When we submitted the request for the 15 gig it was turned down because it would have cost £150,000 and put the project way over budget.
The project requirements were pruned drastically and the database redesigned accordingly.
I can now get a 400 gig hard drive for fifty quid!