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Samsung 840 EVO read speed drops on old-written data in the drive - Page 315

post #3141 of 3279
Quote:
Originally Posted by bogdankr View Post

Were you testing it with 8MB block size?

There's no such thing as 8MB block size (at least not as a standard size for SSDs). Maybe you mean 8KB.
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post #3142 of 3279
We may be talking about different blocks. See HD Tune > Options > Benchmark
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post #3143 of 3279
Yes, there is in this program:

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post #3144 of 3279
Quote:
Originally Posted by bogdankr View Post

We may be talking about different blocks. See HD Tune > Options > Benchmark

Ops, didn't see it for some reason, oh well! thumb.gif
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post #3145 of 3279
Quote:
Originally Posted by dvsv View Post

64KB (i think it's the default value for the free version of HD Tune).

Anyway there's another report here (850 Evo mSATA):

http://forums.anandtech.com/showpost.php?p=38057282&postcount=54
http://forums.anandtech.com/showpost.php?p=38057306&postcount=55



We need more testing of 1 yr+ old 850 Evo drives!
I thought this wasn't supposed to happen at all due to the higher node-size of 40nm.

And from that thread:
"The degradation is supposed to happen on the 850 EVO as well, albeit at a considerably slower pace, and it should be completely hidden by internal cell refresh algorithms."

Jeez...
post #3146 of 3279
If the 850 EVO has issues, then the problem isn't just the ECC being slow or the node size, it may be the way Samsung handles their TLC in firmware or event heir TLC designs.

The V-NAND used in 850 EVO is entirely all new and different though so the EVO, if it does have issues may be entirely different
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post #3147 of 3279
I also own a Samsung 850 EVO but there are only 2 months since I started using it, migrating from an older HDD with a Macrium Reflect drive image.
I periodically did some HD Tune tests on it, and yesterday, after reading the post about problems with stale data (again, I went through this with 840 EVO as well) I did some more tests.

I did find some lower read speed area at the 'start' of the disk for about 10-15% and then some very small cliffs here and there, but the performance on those did not go lower than 390 MB - 400 MB. At a later run, on the same machine, the start of the disk looked a bit different, as if speed had improved here and there. Also, the lowest read speed did not go under 400 anymore, but had the minimum at about 420 MB. All of these runs were made with the 8MB block size and the most accurate (slowest) test speed.
I'm really wondering if this might be a general problem, as the 840 EVO had.

Can someone confirm about the fact that there's no 'updated'/new firmware for 850 EVO aside from the one pre-installed when you purchase? I wasn't able to find one on Samsung' pages.
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post #3148 of 3279
I use stock firmware. 850 EVO 120GB, 10 months in use, average speeds are roughly about 20MB/s slower than on fresh out-of-the-box drive.

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post #3149 of 3279
Quote:
Originally Posted by coffeeplus View Post

I also own a Samsung 850 EVO but there are only 2 months since I started using it, migrating from an older HDD with a Macrium Reflect drive image.
I periodically did some HD Tune tests on it, and yesterday, after reading the post about problems with stale data (again, I went through this with 840 EVO as well) I did some more tests.

I did find some lower read speed area at the 'start' of the disk for about 10-15% and then some very small cliffs here and there, but the performance on those did not go lower than 390 MB - 400 MB. At a later run, on the same machine, the start of the disk looked a bit different, as if speed had improved here and there. Also, the lowest read speed did not go under 400 anymore, but had the minimum at about 420 MB. All of these runs were made with the 8MB block size and the most accurate (slowest) test speed.
I'm really wondering if this might be a general problem, as the 840 EVO had.

Can someone confirm about the fact that there's no 'updated'/new firmware for 850 EVO aside from the one pre-installed when you purchase? I wasn't able to find one on Samsung' pages.

If you have one of the newer versions of Magician, there is a version EMT02 (i think it starts EMT, and i don't remember the rest of it) FW. and the stock FW is EMT01.

Also have you guys tried HD Tune Pro 5.6? you can use the trail version. If i remember correctly from last year, the free version 2.55, doesn't bench SSDs correctly. Also, drivers affect the results of the speed on HD Tune Pro as well.
Edited by Palorim12 - 2/29/16 at 6:11am
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post #3150 of 3279
Quote:
Originally Posted by hurda View Post

I thought this wasn't supposed to happen at all due to the higher node-size of 40nm.

It's not. What folks are seeing here is most likely just flash-level fragmentation caused by normal use. When the sequential (logical) reads hit these areas, they slow down because the (physical) flash reads on those areas are actually random. This effect occurs on all SSDs / flash memory types.
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