@piggo Our farm came with lots of discs too. None of them had any data on though. They had a string tied through the hole and were dangling from tree branches and sticks pounded in the ground.
@piggo Also the discs break down in the sun and get brittle and shatter
@piggo Recycling bin?
@piggo The internet has loads of crap suggestions... and this. Do this:
[edit: better link]