system
A chat on subreddit /r/pcmasterrace
human
Wipe the shiny mirror like disk with a sand paper.

Oh and when you are done wiping just flip the sand paper, cut it into a disk shape with a hole in the middle and super glue that shit to the platter (the shiny mirror thingy) make sure rough side facing up

Now you go to your attic and get those old knives and scissors and plug this hdd into power and make those dull knife edges fine and useful again

You have a free sander. 
You also reduced e waste.

What you just did is called DIY Upcycling old products or repurposing shit to new roles instead of offering them to a land fill.
gpt
With 30-60 gradation to make it really smooth and shiny :)