I have 4x 8TB Red Pro 256 MB Drives (WD8003FFBX-68B9AN0) in a Synology DS918+.
I’ve had some problems with them in the past as entailed here:
Apart from the noise they’re exhibiting as described in the thread above – which I’m not sure if it’s normal or not – they are also doing a strange “rev up noise” many times a day.
Audio clip: https://vocaroo.com/i/s1QU1QWYINJZ
The “rev up noise” is actually two different noises. A brighter “rev up” spinning sound in the background, and more prominently a sudden rasping/grinding/aggressive sound – both occur at the very start of the clip. This usually occurs when initiating a new process like Time Machine backup. However, the sudden raspy/grinding sound can happen almost anytime inside of a backup (which can take up to an hour sometimes depending on the size of data changed).
The grinding sound really stands out in noise level and ‘aggression’ to normal operation sounds from the helium drives.
Is there anyone who can confirm whether these noises are normal for helium drives? Something tells me it’s not normal.