[SOLVED] how is the remaining SSD life calculated??

[Pextaxmx]

someone is selling a Chia plotting SSD claiming 50% life left... Then the host writes is nearly 2PB which is more than the warranty TBW (1.2PB).

 

[Lafong]

All of that in only 1958 hours, which amounts to 980 GB written per hour. 2 Petabytes in less than 3 months of 24/7 operation.

Not sure I've ever read the details of the "remaining life" algorithm. Is it known to be standardized across manufacturers?

Standard crap shoot stuff. Maybe it lasts another 50 years.

 

[USAFRet]

Unless this 970 Pro were selling for <$20, that's a hard pass.

Lifespan calculation is a fuzzy concept.
This particular drive could die tomorrow. Or live another 20 years.

 

[USAFRet]

Is it known to be standardized across manufacturers?

It is, AFAIK, not standardized.

 

[fzabkar]

CrystalDiskInfo is looking at the Percentage Used attribute. Its raw value is 0x2F which is 47 in decimal. I'm guessing that the SSD's firmware arrives at this number by referring to the number of Program/Erase cycles.

 

[alceryes]

Definite pass.
With SSDs, I've noticed that the loss in health actually speeds up the lower the 'health percentage' is. This drive could go 'chips up' within 3-12 months.

 

[Pextaxmx]

Definite pass.

I was not interested at all

I'm guessing that the SSD's firmware arrives at this number by referring to the number of Program/Erase cycles.

That's interesting. If true, the Percentage Used number actually represent the reality, unlike the host writes number.

 

[fzabkar]

According to the NVMe standard:

https://www.nvmexpress.org/wp-content/uploads/NVM_Express_Revision_1.3.pdf

Percentage Used:

Contains a vendor specific estimate of the percentage of NVM subsystem life used based on the actual usage and the manufacturer’s prediction of NVM life. A value of 100 indicates that the estimated endurance of the NVM in the NVM subsystem has been consumed, but may not indicate an NVM subsystem failure. The value is allowed to exceed 100. Percentages greater than 254 shall be represented as 255. This value shall be updated once per power-on hour (when the controller is not in a sleep state).

Refer to the JEDEC JESD218A standard for SSD device life and endurance measurement techniques.

 

[USAFRet]

The compelling question regarding this 1TB 970 Pro Chiapet has not been answered.....How much are they asking?