[greglindahl]

As other people have noted in this discussion, the curve of battery capacity over time does not jive with an overprovisioning strategy.

Both HDDs and SDDs show no almost no degradation until they suddenly have a ton of degradation. (I've owned 3,000 SDDs, 15,000 HDDs, and 1 Model S.)

[dogma1138]

It doesn’t jolt with their EPA filings which indicate higher capacity for each model time and time again I’ve linked to one from 2013 below and it’s the same story every time.

The degradation pattern is ofc different because SSDs or HDDs are essentially binary the sector or cell is either good or bad and when you go out of spare sectors you are screwed.

Also most of them have many other modes of failure which do not involve their primary capacity.