SSD Wear

[troll]

Hi, I have a question about SSD endurance. If your SSD has an endurance of 100TB and you've written 10TB, am I right in assuming that is 10% wear and 90% remaining?

I say this because I have a drive that has only had 10TB out of 100TB written but the SMART is showing 30% wear.

 

[troll]

Yes but no.

It can depend on how the wear level is calculated, as some manufacturers calculate it differently.

It is also affected by write amplification - where lots of small writes can cause bigger "pages" of flash to be erased and rewritten. So e.g. you might write 1KB to the drive, but as a result of having to erase an entire 4KB (or larger) page, the amount of data written can be amplified.


SSD Endurance is only a guideline however, used by manufacturers to provide a figure generally for warranty length - with most drives writing far more than the Endurance figures would suggest.

Thanks for the detailed response.

When the SSD shows 100% used after 100TB, even though you should have 300TB left because the endurance is 400TBW, would you trust your data on it?