I'm considering one of these, or perhaps 4x 2.5" in a 5.25" bay. Two 2.5
inch 500 GB disks will be around twice the price of a single 3.5" 1 TB
disk, but as far as I can see they will be quieter and lower power (even
with two of them), and faster (using raid0).

That's also my curiosity!

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