I'm researching best media for long-term offline storage. I've decided a couple mirrored, different brands, spinning HDDs being powered every 6mo is the best spot for amount of data x reliability x convenience. (This is just for context, don't want to debate this)

One factor I cannot account for is the mechanical differences between 2.5 and 3.5 (not even reaching the brand/model details). Are 2.5 and 3.5 internals exactly the same but in a smaller scale? or not even different scale and everything (or at least the spindle) inside is exactly the same and just the data disk (platter) radius is smaller? Or is the tech completely different?

I want to make an informed decision since my research says that for offline storage, the major issue with HDDs are temperature and impact -- easy to control, and spindle lubricant drying up (since no driver users ball-bearing anymore which is better for constant high RPM but worse for long term offline storage). -- impossible to control if I don't know more details

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