Nonvolatile storage by definition doesn't use any energy to retain data after it's been written. But an HDD needs some to spin either way while it's on, even wh

Nonvolatile storage by definition doesn't use any energy to retain data after it's been written. But an HDD needs some to spin either way while it's on, even when it's not currently being accessed. I can kinda see where they're going though — if this discovery enables increased bit density on magnetic media, you need fewer HDDs to store the same amount of data, so they use less energy when they're on.