I have just received 4x Red Pro 8TB Drives for use in my Synology DS918+ NAS.
When reading a Time Machine backup onto my Mac from the NAS drives, halfway through the backup process, one or more of the drives started to make a very strange “beeping” sound. I don’t believe it was beeping per se, but it sounded like the HDD drive head was stuck and potentially damaging the rotating disc. It made this noise many times each minute, for a couple of hours, and then stopped. Since then, I have not heard it make the noise.
I am concerned that one or more of the drives are defect and/or damaged by this. I don’t know which drive might have been the problem.
Please see this video, where the sound is through-out, but particularly after 00:30:
Is this a problem you recognize? What should I do about it?