Writing data in the SSD and driving it back to irrecoverable What is the truth about reliability found in the durability test?

From 2013Tech Report"SSD endurance test" which was continued is to use the special program in the main six models of the SSD to write unusual amounts of data and to drive it to the point where it can not be recursed and tend to be uneasy about durability It is attracting attention as data that is useful for judging the reliability of SSD. And the model that survived to the end finally stopped breathing, and the SSD endurance test lasted for one and a half was completed completely. From that point, the facts about the reliability of the SSD are revealed.

The SSD Endurance Experiment: They're all dead - The Tech Report - Page 1
http://techreport.com/review/27909/the-ssd-endurance-experiment-theyre-all-dead

◆ Test progress so far
Detailed contents of the SSD endurance test can be confirmed in the following article. Corsair "Neutron GTX 240 GB", Samsung"840 250 GB"Kingston"HyperX 3K 240 GB", Intel"335 240 GB", Samsung"840 Pro 256 GBOut of Intel 335, Kingston HyperX 3K (no compression function), Samsung 840 were forced into unusable state by June 2014.

How long life of SSD such as Intel · Samsung is found by long-term durability test - GIGAZINE


Corsair Neutron GTX, which endured rewriting data of over 1 PB (1000 TB) over, finally ended in 1.2 PB. The SSD endurance survival has entered a match race by two models of Samsung 840 Pro and Kingston HyperX 3K (with compression function). The situation at that time can be confirmed in the following article.

Which models overwrote the 1.5 million GB wall written in SSD durability experiments? - GIGAZINE


The two models that survived totally broke through the 2PB mark without giving away. It looked like it would be an endless fight.

How much performance will fall when writing 2PB (2 million GB) to SSD? - GIGAZINE


◆ Throne determination
Next was killed "Kingston HyperX 3K". Like the Intel 335 series, with SandForce chip, the powerful compression function was effective, but I was out of breath at 2.1 PB. However, "HyperX 3K is not accessible after the power outage occurred in the Christmas season of 2014, it is confirmed death", so it is unlikely that the longevity could not be fulfilled due to a power outage incident Attention is necessary for unlikely points.


Ultimately Kingston HyperX 3K succeeded in writing 2.1 PB (purple). However, the actual writing by the compression function is about 1.5 PB (red).


A red graph is a measure of the life span displayed by special software. Keeps almost parallel state after 900 TB. However, as you can see from the pale purple graph, after 2PB, you can see that the error that sectors can not be relocated is rapidly increasing.


It seems that the erasure error (dark purple) also has been increasing rapidly since 2PB.


So, what survived to the end is "Samsung 840 Pro (256 GB)". Samsung, known for its reliability as a memory maker, finally celebrated the crown after a fierce battle that lasted for a year and a half.


The throne has been decided but the Tech Report continues the experiment to stop the breath of Samsung 840 Pro. And, in February 2015 Samsung 840 Pro ceased to be recognized, it finally got out of breath. The appearance of Samsung 840 Pro's sector relocation impossible error is like this. The error seems to have increased at a constant pace according to the amount of writing.


Dispersing the write in the entire memory so that writing does not concentrate on a specific memory cell realizes long lifeWear levelingThe function (yellow) is almost ineffective at the point of 600 TB. However, plenty of writable blocks (red) remained, and it turned out that 20% of the 2.4 PB extinction went on to leave a surplus.


◆ Summary
As mentioned above, it turned out that the SSD endurance test continued over a long period of more than one year has ended, and it is possible to rewrite a large amount of data that all six models can not be written at normal use. It is also clear that all models achieved writing above the manufacturer's nominal value. Also, if you detect the possibility of an error while leaving enough power, even Intel 335 that dropped out earliest with a stop will have about 70 thousand days, or about 190 years, even if 10 GB of data is rewritten every day It is certain that there is almost no need to worry about the rewriting lifetime of SSD.


Furthermore, not only the reliability of SSD but also astounding durability (performance keeping) are revealed. This is a graph showing the relationship between the data write amount (horizontal axis) of all models and the speed (vertical axis) of sequential read (4 MB). Almost, it keeps high reading speed until all models die.


Sequential light (4 MB) is like this. The writing speed is also maintained.


Random lead (4 KB) which greatly influences "sensible speed" also maintains the speed.


It has become clear that random light (4 KB) also maintains superb performance.


The average value of data writing speed is like this. Although it keeps the average speed generally, Corsair Neutron GTX seems to be characterized by each model as speed slowly decreases just before dying and Samsung 840 Pro speed fluctuation range is large.


It was revealed that all the major SSDs tested by Tech Report demonstrated reliability and durability far exceeding user's expectations. Also, there was a precursor that error occurrence will increase before any SSD goes into the write-disabled state, and it was found that SSD's monitoring software will notify us of it. From the SSD endurance test this time, it seems to be concluded that the durability and reliability of SSD has evolved to a completely undoubted level.