ABSTRACT
In a computer, programs and data must be stored somewhere called storage. Without storage, a computer has nothing to compute. Storage can be divided into volatile and nonvolatile. Volatile storage requires electricity, and can keep data only when a computer is turned on. Volatile storage is usually called “memory”. Non-volatile storage persists when a computer is turned off or rebooted: for example, flash memory or hard disks. Flash memory is also called a solid-state disk or SSD.
