system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does saved data not weigh anything?

Why is it that when you save things to an empty hard drive it does not get heavier, why does data not have weight?
gpt
In general, data is just a bunch of lightswitches turned on/off. Without something saved, everything is turned off. When you save something it's a lot of on off on off off on on off on off, so there's no difference in the amount of lightswitches. Your harddrive "filling up" just means "we're keeping track of these lightswitches"