I also followed a course that was based on the Silberschatz/Gagne/Galvin book, and when searching for background I found many courses based on the same - they were structured extremely similar.

Honestly, I don't see the point of all these instructors making their own summaries of the same book. I think that all these summaries condense the material to the point they're barely more than PowerPoint lists.

Can someone that learns better using this format explain why?