Hard Drive Stats for Q2 2018

I've always had a question about those stats. "Drive days" seems a key figure; but 1000 drive days may mean 100 drive with 10 days each, or 10 drives with 100 days each. This kind of metric implies that the chance of failing is independent of the age of the drive. Is that so? Was that verified? One of the most failing drives around is the Seagate 4TB, which is a quite old model (it exists since 2013, but it's still sold). How is the drive cohort composed? If it's composed by many old drives and many very new drives, it could mean that we're observing a "mean value" with very little significance.

It would be GREAT to have a "long form" CSV with a) drive model b) service start date (or service hours cont) c) failed/not failed during quarter. THAT would help understanding whether drives fail at random or because of old age (and/or what is the correlation between age and failure - there's a threshold effect, or it's linear?)

Anecdote: this one drive I have with more than 10 years power on:

  Model Family:     Hitachi Travelstar 5K160
  Device Model:     Hitachi HTS541660J9AT00

    9 Power_On_Hours          -O--C-   001   001   000    -    89479
   10 Spin_Retry_Count        PO--C-   100   100   060    -    0
   12 Power_Cycle_Count       -O--CK   100   100   000    -    112
  191 G-Sense_Error_Rate      -O-R--   100   100   000    -    0
  192 Power-Off_Retract_Count -O--CK   100   100   000    -    47
  193 Load_Cycle_Count        -O--C-   001   001   000    -    18380622

According to spec the "Service life of the drive is approximately 5 years or 20,000 power on hours" and "The product supports a minimum of 600,000 normal load/unloads"

Andy or Yev: what do you do with the working drives that are pulled to be replaced due to density reasons? Recycled?

Is there a reason these blog posts embed the tables as images? Is it to prevent the results from getting indexed or just convenience? Because it also makes it impossible to copy/paste the model numbers when looking up pricing. :(