Reality check here. Sony unloaded Vaio almost two years ago and before that were notorious for lack of support. They were a disaster in the realm of computers. Dream on if you expect them to give decent support two years after they have stopped making computers. W10 wasn't around when they made their last laptops.
Perhaps all very true. But, you still can't pin Sony's warranty fulfillment issues on Western Digital, no matter how much you would love to,
An OEM part, sold to an OEM, is the OEM's responsibility, and end user's problem.
Nobody said life is fair, and in very few places is it less fair, than in the realm of discontinued electronics.
A proud owner of the VAIO than has two courses of action. Throw the drive away and buy a new one.....or....,throw the laptop away and buy a new one. I might add that the latter course of action, seems to be the most popular nowadays...
A new laptop would be faster, cheaper, lighter, and more stylish
(*). Reasons aplenty to leverage yourself right into a new one. Hell, you're mad at Sony? That's one helluva good reason to buy a Macbook Pro!(y) And.........., you'll be teaching Sony a lesson in the process...
(*) Before I forget, a new laptop would have Windows 10 on it. It's the best Windows ever! I know, because I say the signs saying so at my local, "Microcenter".