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What is an external hard drive(HDD) made of?

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inside the harddrive: the storage medium: platter: metallic -often aluminium (and far rarer glass-ceramic) disk, non-uniformly coated with a strongly magnetic compound (usually Samarium-Cobalt, but possibly Neodymium). read more

An external hard drive is composed of: 1. A regular hard drive. For consumer products, this is typically a notebook hard drive. (Any other hard drive will require a separate power connector because USB will not be able to provide enough power.) 2. A bridge. This is something that converts between USB and the interface and power of the hard drive. read more

A hard disk drive (HDD), hard disk, hard drive or fixed disk is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks coated with magnetic material. read more

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