&gt; I&#x27;ve had about 3 850 EVOs go bad on me, just completely lock up the machine they are connected to, can&#x27;t even run diag<p>That&#x27;s worrying. It should at least stay a proper PCI-E citizen, not lock up the computer. And it should always provide the SMART data, even if the SSD is dead otherwise. And even if writing isn&#x27;t possible anymore (safely, due to many bad bits), it should lock-down to read-only.