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non-volatile storage

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(storage)non-volatile storage - (NVS, persistent storage, memory) A term describing a storage device whose contents are preserved when its power is off. Storage using magnetic media (e.g. magnetic disks, magnetic tape or bubble memory) is normally non-volatile by nature whereas semiconductor memories (static RAM and especially dynamic RAM) are normally volatile but can be made into non-volatile storage by having a (rechargable) battery permanently connected.

Dynamic RAM is particularly volatile since it looses its data, even if the power is still on, unless it is refreshed. An acoustic delay line is a (very old) example of a volatile storage device.

Other examples of non-volatile storage are EEPROM, CD-ROM, paper tape and punched cards.

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SD is an acronym for Secure Digital, a technology standard for providing portable devices with non-volatile storage and peripheral I/O expansion capability.
It utilizes an embedded microcomputer system, including software, conventional RAM and ROM, larger non-volatile storage, communications interfaces, user interfaces and analog-digital support for the audio inputs and outputs.
In general, RAM is a kind of volatile storage while NOR and NAND are both characterized by non-volatile storage.
 
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