Having just woke and completed my first cup of coffee I see I am still way too late to the party.
Boot time is now > 20 minutes too
A classic sign of drive failure, but also driver failure, among other things. It appears you eliminated those "other things" while I was listening to my dog snore all night - since he has lost nearly all his hearing (he's 12 years old now), I think he snores louder just to hear himself!
Failing Seatools would have convinced me and is all the excuse needed to start an RMA with Seagate - if a Seagate drive - and if still under warranty. But your screen shot says they are WD drives so you can run Dataguard from here
. Though Seatools can be used to diagnose other brand drives effectively, WD may want you to run their tool anyway. I have never had WD or Seagate give me any hassle if the drive fails their own tool. Of course, the point is moot if out of warranty.
That said, plug the serial number in here
to check your warranty status. If still in effect, you can start a hot exchange (they send replacement first, you return old in the same box).