The image is an open book with two pages. The pages are black and white and appear to be old and worn. On the left page, there is a diagram of a computer screen with a graph on it. The graph is divided into three sections. 

On the right page, it shows a computer monitor, keyboard, and other electronic devices. The monitor is placed on a desk with a keyboard and a mouse. The keyboard is connected to a power supply unit. The mouse is also connected to the monitor.

In the center of the page, the diagram shows a waveform with multiple lines representing different data points. The waveform is labeled with the title "Hard Disk Recording". Below the diagram, there are several smaller images of the data points, including a graph, a bar graph, and a bar chart. The text on the page is written in a simple, sans-serif font.