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Non-Volatile Memory

Memory whose storage ability is retained when power is removed
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Description

Non-Volatile memory is persistent without the need for power. While some technologies may have a definite shelf life after which their contents are not guaranteed, those times are much longer than most people would want as a duty cycle. For example, magnetic tape could be considered to be a form of non-volatile memory, but the material itself will degrade over time, making its contents unreliable.
The main types of non-volatile memory in use today are ROM, OTP flash and disk.

Related Books
Nonvolatile Memory Design: Magnetic, Resistive, and Phase Change