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Interesting, finally I have an idea of why my phones have always gotten slower over time. Is there a way to measure error rates and/or average storage latency on my (Android) phone somehow?

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eMMC usually has csd and ext_csd registers that tells information regarding wear level and such. It's easy to access these from Linux, but not sure how we would do it on Android.

You can build/install mmc-utils on the device (even from Google's repo,[1] if outdated) but can't access the storage device paths without root. If you're on a custom ROM, the mmc command might even be part of it.

1: https://android.googlesource.com/platform/external/mmc-utils...

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