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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.
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.
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).