Have you ever seen a modern landfill? For one thing they crush the contents by constantly rolling over it with a steamroller with spiked wheels that’s designed to shred & compact the trash as much as possible. Then there’s corrosive materials in the garbage that mixes with rainwater to create a leechate that will corrode other garbage as it seeps through it.

I’d be shocked if a standard hard drive could survive a decade in such an environment.