Lowest Noice HD configuration?

[Enquiries]

I am planning building my own "NAS" with UnRAID (using an SSD write cache) and is trying to figure out what will be the most quiet disk configuration as I am forced to have the "NAS" in a room used for other things.
I have looked at some of your noice tests but have a hard time drawing conclusions from it.
As I will use a write cache I do not care much about the noice when the disk are writing and I expect my reads to be sporadic (mostly when watching Plex or doing backups) so idle noice is what I am most conserned with.
I am also trying to figure out if a smaller number of large drives (say initially 3 x 20 TB with one as parity) or several smaller (say 5 x 10 TB) will make more noice as larger typical "enterprise" drives are mentioned as making more noice?!
I am not in need for any enterprise features like encryption.
In particular drives that say every minute makes some periodic noice evewn at idel would be very annoying I think...

Any thoughts?

[ed]

It depends on where you keep your NAS. If it is located in a coms room behind where the router lives, you will not hear anything (any drives are OK).
If you keep your NAS in the living room, the sound might be quite annoying. Especially if you go for the biggest drives. It's not the spinning sound but rather chiselling.
Smaller drives will generate less noise. But only SSD would be silent. If you install OS and apps on SSD and keep HDDs for archives, this would allow those drives to hibernate and generate no noise.
Here is a tool to help decide about drive https://nascompares.com/answer/hdd-price-per-tb/
Otherwise, do check spec sheets, The same drive can have different noise levels. Check the serial here https://nascompares.com/answer/wd-red-or...d-red-pro/

I hope this helps.