Non-Volatile Memory

Data Persistence

Information is written to the physical medium using techniques that create a permanent or semi permanent change in the cell state. In most modern electronics, non-volatile memory takes the form of flash storage, where electrons are trapped in a floating gate. This allows the device to start up instantly with its previous settings intact.

Retention Cycle

Cells degrade over time as they are erased and rewritten, eventually losing the ability to hold a charge. The lifespan of non-volatile memory is measured in program and erase cycles, which can range from thousands to millions depending on the technology. Wear leveling algorithms help extend the life of the storage by spreading the write operations evenly across the entire chip.

Access Speed

Reading data from these chips is generally slower than reading from the main system memory. While non-volatile memory is essential for long term storage, the processor typically copies the code into RAM for faster execution. This balance of speed and persistence is a fundamental aspect of electronic system design.