system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does an SD card become write protected when you slide the little switch down on the side?

How does moving the little switch on the side of an SD card write protect it when accessing it from a computer?
gpt
This was also done with floppy disks, music cassettes and VHS cassettes, and they made it work the same way on SD cards as they did on those older media: depending on the position of the switch, it either trips or doesn't trip a little microswitch inside the card reader, telling the card reader whether it's allowed to write to the card or not.