Memory systems form the backbone of all digital computing, providing the essential capability to store and retrieve data. From the fastest processor registers to massive storage arrays, memory technologies span an enormous range of speed, capacity, and cost trade-offs that shape computer architecture and system design.
Understanding memory systems requires familiarity with diverse technologies, each optimized for a specific role within the memory hierarchy. Static memories deliver speed without refresh overhead, dynamic memories provide the density needed for main memory, and non-volatile technologies retain data without power. The architecture and management techniques that organize these devices, from cache hierarchies to virtual memory, determine how effectively a system bridges the widening gap between fast processors and comparatively slow memory.
This section groups the field into four related areas, progressing from the volatile technologies that hold working data, through the non-volatile technologies that persist it, to the architectural methods that tie them together.