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[TechReport] The SSD Endurance Experiment: 500TB update

post #1 of 40
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I am running out of ways to introduce our SSD Endurance Experiment. This long-term write endurance test began in August, and we've published numerous updates since. Now that our subjects have crossed the 500TB mark, it's time for another checkup.

post #2 of 40
So glad that TR is doing this so that we can actually see long term effects on NAND endurance, especially with all the hubbub about TLC NAND on the 840.

Looks like she's burning NAND to stay alive. worriedsmiley.gif Hang in there buddy. thumb.gif
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post #3 of 40
I really wished they had tested more controllers. At least a SanDisk Ultra Plus, Crucial M500 preferable. Wow. Nobody ever say SSDs have a finite number of writes ever again. That's scary-durable.
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post #4 of 40
So all drives but the TLC chips in the 840 series are doing perfectly fine then. Not surprising really to me. Im glad though that the TLC chips can at least keep going to 500TB though even if it is having to start re-allocate sectors quite a lot. I doubt many people will go past or even get to 500TB of data written in the life of their SSD.
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post #5 of 40
I am having trouble understanding the article.


Can someone tell me what the verdict is?

Are SSD's life low?
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post #6 of 40
Glad someone I doing this . Intel will remain to be my primary choice
post #7 of 40
I'm betting at least three drives make it past 2 Petabytes.
(Feeling really good about my M500960GB purchase right now)
post #8 of 40
Quote:
Originally Posted by CynicalUnicorn View Post

I really wished they had tested more controllers. At least a SanDisk Ultra Plus, Crucial M500 preferable. Wow. Nobody ever say SSDs have a finite number of writes ever again. That's scary-durable.

In their 300TB update they covered why they chose these specific SSD's. The reason was because enough not all SMART attributes are standardized.
Quote:
Originally Posted by The TechReport View Post

The lack of standardization for wear- and health-related attributes seems to be part of the problem here. Each SSD maker exposes a different mix of variables, making comparisons difficult. We'd like to see SSD vendors agree to offer a common set of attributes covering reallocated sectors, accumulated errors, overall health, and both host and flash writes. Some SSDs don't even have SMART attributes to track total writes. The Crucial M500 is one example, and we left that drive out of the endurance experiment as a result.
 
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post #9 of 40
Even 100TB writes without issue is astounding. Easily more than enough for most people. And I guess the 840 is still good up to 300TBs since it didn't have any major issues that affected day to day reliability. Also, it's nice to see the HyperX 3K do so well. It would seem I made a coincidentally good decision to invest in one.
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post #10 of 40
Quote:
Originally Posted by bencher View Post

Can someone tell me what the verdict is?

Are SSD's life low?

All of the SSD's tested have exceeded 500TB of data written to them without any major problems.
(Edit: The Samsung 840 briefly had some issues with corrupt data around the 300TB mark. It seems my brain may have had some similar data retention problems. Thanks for pointing this out rui-no-onna. [post: http://www.overclock.net/t/1458940/techreport-the-ssd-endurance-experiment-500tb-update/30#post_21580738] )
Quote:
500TB works out to 140GB of writes per day for 10 years.

In short, I will never be worrying about "wearing out" my SSD.

The talk about the Samsung 840 drive reallocating sectors means that some sections of its memory have worn out and can no longer be written to. When this happens bad sectors are no longer used and the drive instead uses memory in its section of spare memory. The spare memory is extra memory that the user can't see or use. This means that the drive can replace sections of its memory without any effect on the overall capacity.
Once all of the spare memory is used up....I have no idea what happens. It will be interesting to see how windows and the Samsung's firmware handle the problem of the drives usable space shrinking.
Edited by jason793 - 1/14/14 at 7:39am
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