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you actually don't need capacitors for rotating media, Western Digital has a feature called "ArmorCache" that uses the rotational energy in the platters to power the drive long enough to sync the volatile cache to a non volatile storage.

https://documents.westerndigital.com/content/dam/doc-library...





Very cool, like the ram air turbine that deploys on aircraft in the event of a power loss.

Good I love engineers



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