Those that go looking for a My Book product history will find that at least ten devices have used this moniker, and over the years they’ve been made with USB, Firewire and eSATA connections, and in a myriad of capacities.

They’re mostly designed to be directly connected to a host PC or Mac, providing a place to offline files that are no longer required on the system, or to backup those that are on it.
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https://www.techradar.com/reviews/western-digital-my-book-8tb-2020