Long story short, my Synology DS 212j DiskStation says my hard-drive is “degraded”.
Both Quick and Extended tests using the Western Digital Diagnostic software say my WD-Red drive is fine, PASS.
Both Quick and Full DiskStation SMART tests, say the drive is ‘normal’.
All tests say the drive is fine!
Synology hits me back and says, “I’m not sure why SMART tests not detecting any errors, but you do have I/O errors on the drive so I would definitely recommend replacing the drive.”
Who’s right and who’s wrong?!