I really appreciate these blog posts and have used the data they present when buying HDDs for personal use.

One thing that bothers me is that the data presented doesn't really take into account the age of the HDDs. For example, if a batch of HDDs of a particular model is 6 years old and has a failure rate of 12%, that really doesn't tell me much except that it's an old HDD.

What I'd like to know, for a given model, what the blended failure rate is after 3mo, 6mo, 12mo, 24mo etc of operational time. That would be a real apples-to-apples comparison.