What does this mean? Well, it means that pretty much NAND flash memory becomes unreliable as the process node shrinks past 20nm. NAND flash manufacturers have hitthe wall when it comes to planar NAND. From this point on the only way to make NAND flash reliable is to reverse the process node shrinkage and go to 3D-NAND where NANDcells are stacked on one another instead of laid out flat.

Samsung started this trend in which they released their 3D-VNAND and reversed the process shrinkage to 40nm with their 850 line of SSDs. Other manufacturers are also doing the same with their own approach to 3D-NAND. Ultimately it comes down to the fact that NAND flash memory manufacturers have hit the wall in terms of shrinking NAND and that as you shrink the process node the NAND has far more of a chance of voltage drifting that can effect read speed performance as the data ages.

It has 3 years warranty, so if my 840 EVO dies before that it should not matter even if it reached 1 PB.

As the end of this article states, it’s not released yet. You will be able to get it from sites like this, or from Samsung.com. You might even get notified by your existing copy of Samsung Magician that an update is available, which is the normal procedure for new versions of Magician.

Benjamin, I don’t have direct experience, but I guess every manufacturer states TBW for some reason. It is the easiest excuse to refuse warranty on one side, on the other side – as we already said – just extremely tiny portion or amount of customers will ever hit that wall.

From 850Pro review on some anonymous site:

“The other major improvement from V-NAND is the endurance. All
capacities, including the smallest 128GB, are rated at 150TB, which is
noticeably higher than what any other consumer-grade SSD offers.
Moreover, Samsung told me that the endurance figure is mainly meant to
separate the 850 Pro from the enterprise drives to guide enterprise
clients to the more appropriate (and expensive) drives as the 850 Pro
does not have power loss protection or end-to-end data protection for
example. However, I was told that the warranty is not automatically
denied if 150TB is reached under a client workload. In fact, Samsung
said that they have a 128GB 850 Pro in their internal testing with over
eight petabytes (that is 8,000TB) of writes and the drive still keeps
going, so I tip my hat to the person who is able to wear out an 850 Pro
in a client environment during my lifetime.”

they may say warranty is not automatically denied if more than TBW is actually written (and it doesn’t matter who says that or how much TBW is), but who knows what really happens when rubber hits the road. In case of Sammies 850Pro and several other models, many capacities share the same TBW which – from engineering point of view – is just nonsense. Bigger capacities must have more endurance.

In the end, I’d say it’s a matter of luck : someone had good day or bad one when he hits your RMA SSD with exhausted TBW.

Enjoy !