It is a feature and a PIA, I got rid of them and went back to my 2016 Red’s but I read some newer Red’s are also loud.
In the past if a HDD made that noise it was error correction trying to read bad sectors so time to backup and replace.
I have 2 (probably last ones made going by date on sticker) 1TB VRaptors (new last month as still sealed till then) and they are quieter than the Red Pro’s idle/running/seeking and overall and far cooler.
I have had many HDD’s over the years from the complete Raptor 10k rpm range and my current 2016 Red 5.4k rpm’s all others were 7.2k rpm models but none were/are as loud as the Red Pro’s dated Dec 2017 build date.
Would seem by reading here and web WD drives are not the same quality as older drives with a of failures.
