I’ve just had this same problem. I have two 3TB Seagate Expansion drives which have worked fine for the past few firmware updates until 1.13.18. Now neither drive will work with the smp.
Both drives work fine with my laptop so it’s definitely a problem with the smp.
I also tried rolling back the firmware but no joy.
WD Support also recommend I do an RMA return but what worries me is am I just going to get the same problem again.
I would like to know if this is a Firmware or Hardware problem.
Well I RMA’d mine. This new one doesn’t work either.
I can see that the SMP is scanning the Seagate 3TB HDD but when you go to select ‘Local Storage’ it always says that there is none present. It begs the question that what was the SMP scanning then if the HDD is not present?
What is really annoying is that it was working fine for a couple of months until the 1.13.18 update.
I find it hard to believe that, by now, nobody at WD knows what is causing this problem.