system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do magnetics remove tape footage?
gpt
Imagine pencils arranged in a certain way to say something- like a big letter A. That letter A represents the data on the tape. When you run a magnet over the tape, its like swiping your hand through that letter A of pencils. The pencils go every which way, and you won't know what it was by looking at it.