Introduction, Specifications and Packaging

Samsung’s 850 EVO and Pro now come in 2TB!


Where are all the 2TB SSDs? It's a question we've been hearing since they started to go mainstream seven years ago. While we have seen a few come along on the enterprise side as far back as 2011, those were prohibitively large, expensive, and out of reach of most consumers. Part of the problem initially was one of packaging. Flash dies simply were not of sufficient data capacity (and could not be stacked in sufficient quantities) as to reach 2TB in a consumer friendly form factor. We have been getting close lately, with many consumer focused 2.5" SATA products reaching 1TB, but things stagnated there for a bit. Samsung launched their 850 EVO and Pro in capacities up to 1TB, with plenty of additional space inside the 2.5" housing, so it stood to reason that the packaging limit was no longer an issue, so why did they keep waiting?

The first answer is one of market demand. When SSDs were pushing $1/GB, the thought of a 2TB SSD was great right up to the point where you did the math and realized it would cost more than a typical enthusiast-grade PC. That was just a tough pill to swallow, and market projections showed it would take more work to produce and market the additional SKU than it would make back in profits.

The second answer is one of horsepower. No, this isn't so much a car analogy as it is simple physics. 1TB SSDs had previously been pushing the limits of controller capabilities of flash and RAM addressing, as well as handling Flash Translation Layer lookups as well as garbage collection and other duties. This means that doubling a given model SSD capacity is not as simple as doubling the amount of flash attached to the controller – that controller must be able to effectively handle twice the load.

With all of that said, it looks like we can finally stop asking for those 2TB consumer SSDs, because Samsung has decided to be the first to push into this space:

Today we will take a look at the freshly launched 2TB version of the Samsung 850 EVO and 850 Pro. We will put these through the same tests performed on the smaller capacity models. Our hope is to verify that the necessary changes Samsung made to the controller are sufficient to keep performance scaling or at least on-par with the 1TB and smaller models of the same product lines.

Read on for the full review!


850 Pro:

  • NAND: Samsung 32-layer 3D VNAND
  • Unformatted Capacity: 128GB / 256GB / 512GB / 1TB / 2TB
  • Max Sequential Read: 550 MB/s
  • Max Sequential Write (256GB and up): 520 MB/s
  • Max Random Read QD32: 100,000 IOPS
  • Max Random Write QD32: 90,000 IOPS
  • Form Factor: 7mm high 2.5”
  • Interface Type: SATA 6.0 Gb/s (SATA 3)
  • Endurance (512GB and up): 300TBW @ 80 GB/day
  • Warranty: 10 years

850 EVO:

  • NAND: Samsung 32-layer 3D VNAND
  • Unformatted Capacity: 120GB / 250GB / 500GB / 1TB / 2TB
  • Max Sequential Read: 540 MB/s
  • Max Sequential Write: 520 MB/s
  • Max Random Read QD32 (500GB and up): 98,000 IOPS
  • Max Random Write QD32 (500GB and up): 90,000 IOPS
  • Form Factor: 7mm high 2.5”
  • Interface Type: SATA 6.0 Gb/s (SATA 3)
  • Endurance (500GB and up): 150TBW @ 80 GB/day
  • Warranty: 5 years

The stated specs for the 2TB models identically match that of the 1TB models of those same product lines. The only difference elsewhere in the specs was the controller type used (more on that on the next page).


Samsung has continued using the standard 850 series packaging for both of these new higher capacity models.

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