glossary Data page

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/18/glossary.html
Description:

> The basic structure used to store relation data. All pages are of the same
size. Data pages are typically stored on disk, each in a specific file, and
can be read to shared buffers where they can be modified, becoming dirty.
They become clean when written to disk. New pages, which initially exist in
memory only, are also dirty until written.

Am I correct in understanding from this description that all files on the
disk will be the same size?
One page = one file?