If anyone is curious what a megabyte of core would look like, see page 732 of "Engineering and Operations in The Bell System", second edition. It has a drawing showing memory cards from their electronic switching systems from 1965 through 1984. Here's a photo of that page [1].

In 1965 they introduced ferrite sheets, and a 1.18 MB memory card was 104 feet long.

1971 brought ferrite cores, and that same storage fit on a card under 9 feet long.

https://imgur.com/gallery/z8nJo3T