Samsung 850 Pro SSD

The Samsung has released its product named as Samsung 850 Pro which is said to be the world’s first consumer SSD with 3D NAND. Samsung will offer four versions of the 850 Pro including 128GB, 256GB, 512GB and 1TB models.


The 256GB, 512GB and 1TB modules claim 550MB/s read and 520MB/s write performance, which is appreciably faster than the previous-generation 840 series’ 540MB/s and 450MB/s. 3D NAND is flash memory that’s built on edge as opposed to in a conventional planar (2D) configuration. This means that a 3D cell structure is tilted on edge compared to a conventional NAND cell. This dramatically increases NAND density if the cells can be packed tightly enough in the die to make the increased complexity worthwhile. Typically modern 128GB SSDs are only good for about 300MB/s but the 850 Pro is very close to saturating the SATA 6Gbps bus even at the smallest capacity. This is due to the much lower program times of V-NAND because write performance has been bound by NAND performance for quite some time now.

The Samsung 850 Pro packs 32 layers of NAND into each flash chip and there are eight NAND dies total in the 850 Pro, implying that Samsung has significantly improved chip density since the first 24-layer NAND dies were announced. It is said to deliver up to twice the density and write speed of traditional 20nm planar NAND flash.

The advantage of changing to a 32-layer cylindrical cell structure means more cells can be stacked vertically, resulting in a smaller footprint and higher density. This means the 850 Pro should deliver blazing-fast speeds and Samsung is already claiming it’s the fastest on the market, while offering the best endurance. Samsung’s Magician software will guide users on how to use these security features.

Overall performance is reportedly excellent, even without Samsung’s drive accelerator technology.

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