Laptops use a 2.5 inch HDD, most desktop cases are designed to hold a 3.5 inch HDD. You may need a special bracket to hold the drive if the case you plan to use only has 3.5 inch bays.
Some modern cases do also include a 2.5 inch mounting spot due to SSDs using a 2.5 inch form factor.
You have my vote already!
As was already stated, capitalism is unsustainable. It seeks infinite growth in a world of finite resources. Capitalism will almost always place short term financial gain over long term issues.
There are only two financial classes. The owner class and the working class. It doesn’t really matter if you make 30k a year or 300k a year. If you sell hours of your life for a salary, you are part of the working class. Capitalists make passive income off others labor. Being “pro-capitalism” is essentially saying that you’re okay giving all but the littlest amount of value you produced to someone else. This is paraded as a good thing in the United States.
As the other comments stated, it can be as simple as turning the light on and off and we already do this with fiber optic network connections. The light particles themselves aren’t carrying the data, just the pattern of on and off.
It is also possible to send multiple streams of light using color filters. It’s called Wavelength Division Multiplexing.