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2.5" 5400rpm HDDs are the most power efficient in my experience. They use around 1W when in normal use.
SSDs generally use power according to their actual utilization. The faster they are the higher the power consumption seems to be. SATA SSDs are generally slower and fall into the 1-3W bracket, NVMe SSDs are more like 5-10W, especially the PCIe 4.0 ones.
Don't quote me on these figures, I have not extensively tested them and they are very rough ball-park ones.
Huh, that’s unintuitive to me. I remember people talking about too many hard drives in a case using too much power before. Overloading it, etc. 1-2W each would not overload a normal power supply. 🤔
Did hard drives just quietly get super efficient when I wasn’t paying attention? Or is something else going over my head here?
There is a huge difference in power-draw between 2.5" 5400rpm HDDs that one would typically find in a laptop and 3.5" 7200rpm HDDs that are often used in servers even at similar storage capacities. The latter typically use 10W each during normal operation and even a bit more during spin-up. But if you want to optimize your NAS for low power consumption you can use those small 2.5" HDDs just fine (of course being aware that these are not built to withstand the same kind of (ab)use as HDDs specifically built for NAS or datacenter use).
Edit: of course these small drives are not available in more than I think 4TB right now, and if you want to built really large pools of tens to hundreds of TB then the bigger 3.5" HDDs at some point become more power efficient for the same storage space.
Probably worth noting that is pretty hard to find new 2.5" drives with reasonable TBW and prices nowadays.
With what I saw with me current HDDs I wouldn’t have though smaller HDD would be the most power efficient. And now I understand better why sometimes I read HDD can be more efficient than SSD.
Any brands/models you would recommend?
I don't think the power efficiency of the different brands is that much of a difference that it makes sense to only buy specific ones. For SSDs it is rather important to buy from reliable vendors that are not only repackaging the cheapest nand chips they can currently find on the market. In the past Samsung was always a good choice, but my most recent purchase of a PCIe 4.0 SSD from them was not so great in regards to reliability, so I am starting to wonder if they are cutting corners somewhere these days.
Ok thanks!
SSDs are by nature going to be more power-efficient than platter drives, as they have zero moving parts.
An SSD could have higher peak power draw due to a significantly higher throughput, but will not be less efficient at converting power into transferred data.
That argument is not valid. Just because it has moving parts does not mean it has a higher power draw. Look at your CPU for example.
Do you have a mechanical CPU for comparison?
Reread my comment very carefully.
https://en.m.wikipedia.org/wiki/Mechanical_calculator Yep it was a thing. Ever heard of "the bomb" https://en.m.wikipedia.org/wiki/Bombe.
And did you compare the two?
Here's one - https://www.computinghistory.org.uk/det/43063/The-Megaprocessor/
Great, now compare their energy efficiency.
Why don’t you and report back your findings.
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Right; so you have none. Got it.
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This is where, in polite conversation, you would rebut with facts and you didn’t. Meaning you’re either ignorant or trolling.
Good day sir.
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Not sure what everyone is arguing about here. Clearly SSD is better for intermittent r/w, whereas HDD can be more efficient at continuous r/w (especially in terms of watts/TB)
Just looking at specs should be enough to see that. SSDs can idle in ready state at close to 0 draw (~0.05w) whereas HDD requires continued rotation to remain ready. So consider an extreme case of writing for 1 minute then maintaining ready state for the rest of the day. For that the SSD will be far more efficient, obviously.
Classic mob mentality. OC could never be wrong, so let's dogpile on the first person to disagree.
Maybe yeah. Also got the sense from the strong opinions that this is a preexisting debate, presumably in the context of continuous workloads or cached arrays with minimal spindown intervals. In that context it’s true that rotational disks still often win in energy efficiency and robustness (assuming we’re comparing them to consumer SSDs and not the latest enterprise u.2 stuff that’s rated for continuous work).
What you claim here with so much confidence is simply false. Those are two totally different technologies, so it is comparing apples and oranges. And yes, I actually tested it and power optimized HDDs (for laptops) tend to use a bit less power than SSD. I was surprised as well.
Byte-for-byte less energy usage?
An SSD can have a higher power draw over a shorter period of time, but not necessarily use the same amount of energy. Remember that power is energy over time.
You are moving goal-posts. Maybe you are right, but it is still false to claim something is always using more power because it has moving parts.
And of course I didn't only test it for 5 minutes, but rather the impact over a longer time period with the same typical workload of a home server/NAS (i.e. a lot of idling).
I'm not moving goalposts, I'm trying to explain more clearly the exact thing I said before. Feel free to read my original comment more carefully.
I did and you are still wrong. Maybe you should read more carefully what you wrote ;) You didn't specify in what way they are more "power-efficient". And the second sentence is pure conjecture with no real basis on facts.
Edit: Ok maybe you will understand it this way: if your workload is never exceeding the data-transfer speed that the HDD can deliver then the additional speed of SSDs is useless (a very common situation with NAS). So then you need to consider which technology is using less power over time under these conditions, and moving parts or not is not the relevant metric there.
Please provide reputable evidence to back up this post.
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Right; so you have none. Got it.
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This is where, in polite conversation, you would rebut with facts and you didn’t. Meaning you’re either ignorant or trolling.
Good day sir.
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