In regards to the disk(s) inside a hard drive.... It's my understanding that the platinum on the disk is currently impossible to recover. However, if you get a large stack of these (50-100) they do sell on ebay... I would bet that amateur engineers/chemists, etc are purchasing them in hopes of developing a new way to recover the platinum. The money they would make from a successful method would probably be way more than any platinum they could actually recover themselves.
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