Knowra Non-volatile memory Non-volatile memory Non-volatile memory retains stored information when its power supply is removed. It includes technologies that store data through physical states that persist without electrical power.
Flash memory : A non-volatile semiconductor memory that stores data as electrical charge in arrays of memory cells. Its charge-storage cells underpin the flash storage used in phones, drives, and memory cards.
Random-access memory : Memory that allows data at any address to be accessed directly, commonly used as a computer’s working memory. Most RAM loses its contents without power, unlike the memory technologies grouped here.
Solid-state drive : A data storage device that uses solid-state memory, typically flash, rather than rotating disks. It uses non-volatile memory for high-capacity, rewritable computer storage.
Dynamic random-access memory : A volatile semiconductor memory that stores each bit as charge in a capacitor and must be refreshed. DRAM is fast working memory, but its charge must be continually restored.
Magnetoresistive random-access memory : A memory technology that stores bits in magnetic states and reads them through changes in electrical resistance. It retains data by magnetic orientation rather than stored charge.
Volatile memory : Memory that requires continuous power to preserve stored information. It is the defining opposite: non-volatile memory keeps data after power loss.
USB flash drive : A portable data storage device that uses flash memory and connects through a USB interface. It packages non-volatile flash storage into removable, rewritable media.
Static random-access memory : A volatile semiconductor memory that stores each bit in a bistable circuit while power is supplied. SRAM retains data only while powered, despite avoiding DRAM’s refresh cycle.
Ferroelectric RAM : A memory technology that stores bits using switchable polarization in a ferroelectric material. Its persistent polarization offers a non-volatile alternative to charge-based cells.
Memory cell : The smallest circuit or physical element used to represent one or more bits in a memory device. Persistence is implemented in cells whose physical states represent stored bits.
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