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I've just been through this recently. I decided to have my 2 backup HDDs spin down when not in use (99% of the time). I ran into an issue though where I needed them to wake up for SMART tests (which SMART didn't trigger). Tried a few things that didn't work so just set them to spin all the time. There's about a 1-2w difference when they're spinning all the time. So it's just not something worth worrying about IMO (In the UK with high energy costs that comes out to 1.3 pence per day roughly).
Spinning up and down hard drives repeatedly drastically reduces their lifespan though. Once a day or so, fine, but if you set a 30 minute idle time or something and it spins them down a dozen times per day, you are putting acceleration forces on the drive many more times than intended.
If you have to buy a new HDD twice as often because you spin it down, any financial or environmental savings is instantly negated and in the end it is much, much worse in both respects.
They were spun down the majority of the time. I'm not an idiot.
My NAS powers up & down about 3 times a day. Drives are all fine & healthy and some have been in there for years.
I don't disagree with your core point though...
If the drive just finished spinning down and then it's triggered for a 1 byte file, spins down, repeat... yeah, that definitely needs sorting out.
Just the initial spin-up lag would do my head in.
But off & on ~ daily, yeah not a problem.
Yeah, you got to pick your battles.