Someday I'm going to take those numbers and try to see how the AFR varies with the age of the drive. I expect 8 year old drives to have a higher AFR than 3yo, and 6 month olds to be somewhere in between, for example.

And then, we could compute what the life expectancy of a given model is given how long you've had it (just bought, few years old, etc)

It'd be fun to compare those across vendors and drive models. There's maybe even enough data at this point that some of the numbers might be meaningful! =)