You are mistaken, while it is true that first revision is stored essentially as-is, this ceases to be true when you create another revision. SCCS stores all the

You are mistaken, while it is true that first revision is stored essentially as-is, this ceases to be true when you create another revision. SCCS stores all the revisions interwoven in single file (the format is called weave) by tracking on per-line basis the range of revisions that contained such line.