With two categories A and B you don't need the same number in each category to compare whether they come from the same distribution. I would be surprised if th

With two categories A and B you don't need the same number in each category to compare whether they come from the same distribution. I would be surprised if the number of drives they have is actually "statistically insignificant" \* but I haven't crunched the numbers. https://en.wikipedia.org/wiki/Pearson%27s_chi-squared_test https://en.wikipedia.org/wiki/Pearson%27s_chi-squared_test \* By this I guess you mean that the null hypothesis of "they have the same failure rate" is not rejected.