A Jignesh Patel, professor in computer sciences at the University of Wisconsin-Madison: A hard disk drive contains a circular shiny silver disk, similar to a CD or DVD but much smaller. This disk is ...

Hard disk drives (HDDs) work by spinning their internal platters. Only while spinning can data be read or written. It’s been decades since they gained the ability to remain online but not spinning in ...

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This disk is coated with a magnetic material, and information is stored by magnetizing very tiny pieces of this surface. Depending on how each piece is magnetized — either a north-south or south-north ...