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Here's a compelling reason: cheap, portable mass storage. Eg. USB3/Thunderbolt-powered multi-terabyte drives that fit in a backpack and don't require external power.

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A 3.5" drive fits in most backpacks, and it can be powered of USB 3.

Not easily. Even an energy-saving drive will probably draw 15 watts of spinup current.

Though of course you can fit a 12v/2a adapter in the backpack next to the drive.

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