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Researchers say they can spy on your browsing by measuring SSD activity through a browser API
(www.tomshardware.com)
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You also have to provide access to your computer so the attacker can produce labeled training data for the neural network that performs the pattern matching for the actual fingerprinting.
Because that's what they did in the paper: they got the data and performed the attack on the same machine. There's no evidence presented in the paper that this identification could be generalised to arbitrary machines and configurations without prior access.
So yes, this is a complete nothingburger.