Shame on the manufacturers.
Q) Why are disks unreadable
A) There are many answers
Q This disk is not spinning, can you help?
A The answer is probably no.
Q Why do files get lost?
A There are more answers to this than days in a year, but typical reasons include
There are several reasons for data loss, and below are the the most common ones
I have seen S.M.A.R.T. hard disk drive modules fail terribly with _no_ hint, from the hardware RAID into which the modules are plugged, that failure is occurring.
I'll vouch for this.
A module that reports S.M.A.R.T. failure in one computer may offer no hint of failure in another computer.