Ask HN: Is there a description of the file layout HN uses to store data?

As far as I know, HN uses no DB and just writes all data to plain text files.

Does this still hold true?

Is there a description of the layout somewhere? I wonder if it is just one file per comment and the name is the id. And what the internal structure of those files is.

I think it would be a very interesting example of a successful Web2 style project that writes to files instead of using a DB.