the magnetic storage devices, use magnetic property of the
materials to save data in bits.
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Magnetic storage:Yes magnetic tapes are permanent storage and are the best permanent storage. These are very slower storage but are very cheap storage then RAM or other kind of memory.
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A hard disk drive is a type of magnetic storage device. A
magnetic storage device stores data on a magnetized medium. Other
types of magnetic storage includes magnetic recording tapes and the
stripes on credit cards.
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Yes; if the storage is on magnetic media then that can be
altered by magnetic and electric fields.