Another Read Performance Fix 840 EVO SSD Coming Later This Month, Any Opinions?

iridiumstem on 16/04/2015 - 02:29
Last edited 16/04/2015 - 02:36

Source: From Anandtech

The new firmware fixes this by periodically refreshing (i.e. rewriting) old data, which recovers the cell charge back to its original state and ensures that no read-retry or ECC that would degrade the performance is needed.
……
Some of you are likely skeptical about the effect on endurance since rewriting the data will consume P/E cycles, but I find this to be a non-issue. We know that Samsung's 19nm TLC NAND is rated at 1,000 P/E cycles, so if the drive was to refresh all cells once a week, even that would only consume 52 cycles in a year. In five years time the total would be 260 cycles, which leaves you with 740 cycles for user data writes (for the record, that's 52GB of NAND writes per day for five years with the 120GB 840 EVO).

I remember people commenting on recent Samsung SSD deal about the read performance hit on older data. What's your opinion on this another "supposed fix"?

Computing

Comments

  • ozhunter on 16/04/2015 - 07:39

    What's your opinion on this another "supposed fix"?

    Looks good. lol

    • iridiumstem on 16/04/2015 - 12:05
      +1

      Frankly speaking, as far as I can see, what they are doing is applying temporary solutions over and over and pretending it's fixed.

      As far as I can see, I think it's going to have a negative effect on the lifespan of the SSD, even though anandtech article is saying that it's almost negligible. I have held off on writing something negative on it, since it's not released yet and I may be wrong, but I personally think it's ridiculous to see Samsung implementing a solution that pretty much copies and pastes the old datas again and again.

      • ozhunter on 16/04/2015 - 13:51

        Yea, saw a few comments saying that, which is a little annoying but I would personally replace mine before its reduced lifespan would be over.

        I never knew there was a problem with, and just did the first fix today.

      • PVA on 24/04/2015 - 18:03

        Yeah, they may say its negligible, but the life is reduced 25% or so, not great. And like you say, it isnt a fix its really a work around.
        They say "so if the drive was to refresh all cells once a week" but what is it really it could be more often, which would make the life worse and also wouldnt performance be hindered because it is rewriting data?

        • iridiumstem on 24/04/2015 - 18:16
          +1

          According to the article, they apparently made sure that the process runs during idle and they only rewrite older cells blah blah blah, we are sucking up to Samsung. Though I guess it sort of make sense, since the cells that are affected are old cells that have been written from 1~3 months ago.

          Anyways, yes, I personally think it's little bit ludicrous for a company to release a fix that may reduce the lifespan of their product. Only reason that I was not being condescending (I've edited what I've wrote), is because there were few arguments for it from other sources I've been reading, stating that it may be negligible and it may not impact as much as people are concerned.

          So I hope that is true and I really hope that it fixes it without reducing the life to something below what's promised.

  • ProjectZero on 16/04/2015 - 09:10
    +2

    I still have a very old firmware for my EVO 840… I think it was the one that it came with when the SSD first came out.

    Haven't noticed any slow downs on anything… is there are way to test if mine has this problem? If it only affects old data, would that slow down windows?

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