I just concluded a decade long experiment. I had a USB flash drive in a jar buried in my back yard since 2015. I dug it up, plugged it in and it suffered no data loss after 11 years idle underground.

It's a usless experiment but everyone needs hobbies.

@Aaron_DeVries

Was the flash memory in that USB Drive older SLC type?

In which case I would anticipate that it would have a longer data retention. 11 years is impressive though.

What make and model was that drive? 🙂

@simonzerafa

I'm unsure if it's SLC or something else, I suspect not as it's an old/cheap 16 gig Lexar USB drive.