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Samsung 850 PRO read speed drops on old-written files... Similar to the 840 EVO, but less critical - Page 2

post #11 of 13
Interestingly, unlike all previous 850 EVOs that use 32-layer 3D-NAND of a larger 40nm process, the 1TB 850 EVO V2 uses 48-layer 3D-NAND of a smaller 21nm process.

First Look at Samsung’s 48L 3D V-NAND Flash
Edited by TELVM - 8/9/16 at 8:20am
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post #12 of 13
Quote:
Originally Posted by TELVM View Post

Interestingly, unlike all previous 850 EVOs that use 32-layer 3D-NAND of a larger 40nm process, the 1TB 850 EVO V2 uses 48-layer 3D-NAND of a smaller 21nm process.

First Look at Samsung’s 48L 3D V-NAND Flash

Kristian Vättö over at Samsung said this about that: "21nm is bitline half-pitch and it is the same as in 32L V-NAND. The 40nm and 3Xnm figures you see around are measuring a different part of the cell."

So they haven't gone back to using an 840-sized litography in the 850 EVO V2.
post #13 of 13
Quote:
Originally Posted by Palorim12 View Post

How is it possible for the 850 pro to have the same issue as the 840 evo, if the 850 pro is MLC and the 840 evo is TLC.

The issue wasnt a TLC vs MLC issue, it was a controller problem where the controller did not compensate voltage drift properly and led to bad file reads after the algorithm drifted too far away from reality. The drive with TLC showed the issue since it was one of the only drives with TLC, and due to the TLC NAND the controller algorithm does need to be more advanced to read much more voltage levels and compensation. So the problem is more likely to happen on a TLC drive than an MLC drive.
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