Heidi Krueger spends a lot of time thinking about format.

It’s a pondering that has occupied her mind for some time, ever since Krueger, now a reference librarian and virtual services coordinator at the St. Charles Public Library, visited the Wisconsin State Archives years ago.

She recalled that the archives had a trove of information accessible only on digital tape. And the archives, at the time of her visit, had just one of the machines needed to read the digital tape – a machine that was no longer manufactured.