Samsung SSD 850 PRO 

Released July, 2014
  • 512 GB
  • 2.5" SATA III
ATTO stores its performance values in 32-bit integers and with RAPID enabled performance exceeds the size of the result variable, thus wrapping around back to 0.
by Kristian-Vättö (Jul, 2014)
Random performance is also brilliant and the 850 Pro tops almost all of our benchmarks.
by Kristian-Vättö (Jul, 2014)

In The News From around the web


Testing Samsung 850 Pro Endurance & Measuring V-NAND Die Size

by Kristian Vättö |
The test regime is similar to the endurance testing but the writes are 4KB random (QD32) to illustrate the worst possible scenario for the drive.
Unfortunately, Samsung's SMART values do not report total NAND writes like Intel does, but the raw Wear Leveling Count basically gives us NAND writes in increments of the capacity of the drive (one P/E cycle = 129GiB of NAND writes for the 128GB drive).

Samsung SSD 850 Pro (128GB, 256GB & 1TB) Review: Enter the 3D Era

by Kristian Vättö |
I believe it is just a relic from the old days that has stayed in the memory industry because deep down binary is based on powers of two but the abnormal die capacity should have no effect on the operation of the NAND or the SSD as long as everything is optimized for it.
The reason why the difference between cell size and bit density is so large is that 2D NAND requires a lot more die area for ECC bytes because it is more error prone.

Specifications Full list of technical specs


Capacity 512 GB
Interface SATA III
Interface speed 6 Gbit/s

manufacturer performance

MTBF 2,000,000 hours

form factor

Form factor 2.5"
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