What Is a Storage Device?

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Data is stored on hard disk drives that can be both read and written on. A hard disk drive (HDD) is a data storage device used for storing and retrieving digital information using rapidly rotating disks (platters) coated with magnetic material. An HDD retains its data even when powered off. Data is read in a random-access manner, meaning individual blocks of data can be stored or retrieved in any order rather than sequentially. Depending on the methods that are used to run those tasks, and the HDD technology on which they were built, the read and write function can be faster or slower.

IBM introduced the first HDD in ...

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