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Samsung 840 EVO read speed drops on old-written data in the drive - Page 32

post #311 of 3279
Quote:
Originally Posted by giggitygoebbels View Post

I would think that too.The SSD have been filled with Windows 7 and a couple of Virtual Machines.However I need to mention that this is an SSD migration,not a clean install of Windows,which might be another factor.

Can you post an image dump of the SMART data under the health tab in HD tune 5.5 so we can see the number of running hours on it.
For reference the 500Gb Samsung 840 I have access to is mostly in stand by mode so has less then 300h on it so its pretty bad for so little run time in 1.5 years.
post #312 of 3279
Thread Starter 
Quote:
Originally Posted by deepor View Post

That's pretty worrying. tongue.gif

This might mean something's going on with the cells and the data in them is getting harder to read and that's why it slows down? Someone speculated about some sort of ECC calculations taking longer for old and untouched data, and your story seems like it would fit with that idea.

I can say for me that the data on the drive got slow on a 24/7 PC, so this happens the same way on always-powered-on cells. Someone speculated that after a reboot there is a slight improvement on reading speed that goes off after a few hours on. I did a few tests on this but my results were incosistent so I cannot confirm that happens really.

From my tests on my system, reading a lot the "old data" during time (or just using the drive a lot) does't improve read speed or affect drive process to slow down and that is confirmed by people using the EVO as OS drive, where usually windows files (the oldest) are also the slowest but of course were read regularilty.
Edited by gino074 - 9/14/14 at 12:55am
post #313 of 3279
Quote:
Originally Posted by G4Virus View Post

Can you post an image dump of the SMART data under the health tab in HD tune 5.5 so we can see the number of running hours on it.
For reference the 500Gb Samsung 840 I have access to is mostly in stand by mode so has less then 300h on it so its pretty bad for so little run time in 1.5 years.
Here:
post #314 of 3279
Quote:
Originally Posted by giggitygoebbels View Post


8h and thats how bad it got? Seems like a bad joke.

I wounder if I should seen your two pictures to Nordichardwares storage expert if thats okay. 8h in 1 year and so much degradation if I read it right.
post #315 of 3279
Quote:
Originally Posted by G4Virus View Post

8h and thats how bad it got? Seems like a bad joke.

I wounder if I should seen your two pictures to Nordichardwares storage expert if thats okay. 8h in 1 year and so much degradation if I read it right.
If you mean send the pics to them,go ahead lol.I barely used that computer after the SSD upgrade.Not exactly 1 year,I got it around June to July last year,but it stayed continuously inactive since around end of August last year other than a GPU upgrade in August this year.
post #316 of 3279
Samsung EVO 500GB (RAPID mode: on + latest AHCI drivers)



gj5ylAc.jpg
Edited by escalibur - 9/14/14 at 6:02am
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post #317 of 3279
    FWIW, I wrote a new SSD benchmarking utility designed specifically to show read speed in relation to data age and have started a new related thread for benchmark results.  Those of you who are interested are welcome to participate.  I am hoping to get some results from both 840 EVO owners and other SSD owners which could help give us all an idea of what SSDs are affected and confirm or deny the correlation to slowness and age.
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post #318 of 3279
this is what i get with Intel 330 180 -- 2 years old

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post #319 of 3279
    Yes, this SSD is not showing any signs of age/speed correlation at all, which is good.  Those summary numbers at the bottom are really interesting though!  Oh, I just got it; never mind.  You're using a non-American regional setting that is swapping decimal points and commas!  Thank you for the result.

    Quick note to all: Please keep EVO related discussion in this thread, and my program's benchmark results in my thread, just to keep things clean. thumb.gif
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post #320 of 3279
Using that CEO link to Samsungs support was useless. They told me I was not living in INDIA so they had no responsibility helping me out. No where could I find that you had to live in INDIA to use that support feature. Swedish support is nice but useless in its own way since they never offer any real answers or useful help.

My parents own one of the effected 840's we have and I asked my mother if she might want to try using the Swedish law that dictates that if a product has a manufacturing flaw you have the right to have it fixed or replaced the 3 first years no mater what the manufactures might wish. If samsung cant or wont fix it with a firmware upgrade then I cant see how the resellers here can deny a RMA case. So samsung might have to take there bad TLC drives back later. We are still waiting to see if media picks it up and Samsung responds with some real answers but if that dont pan out I will most likley start doing RAM claims using this very law in Sweden since there is more then enough evidence to support my claim.

I have returned faulty hardware with less prof of manufacturing defects so dont see a problem other then the hassle is self to find replacement drives to keep the systems running while the drives are being replaced and th work involved in taking the effected systems apart and migrating the software.

EDIT:

Ran the new test program on the Samsung 840 500GB (No EVO)

IT has two partitions, C for windows and D for storage.
C:\

D:\


Pretty much what i expected.

Samsung 840 is just as effected as the EVO.
Edited by G4Virus - 9/14/14 at 12:29pm
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