5.13 Memory hierarchy

• Desired - no cost, very fast, large von-volatile
• Actual Registers, cache, DRAM, Disk, tape, CD, Flash & EPROM
• Registers - fast, local, volatile, VERY expensive, very small
• cache - fast, expensive, volatile, small
• DRAM - medium size & speed, volatile
• Disk - slow, low cost per byte, von-volatile
• tape - very slow, very low cost, durable, von-volatile
• CD - slow, "read only", good data density, von-volatile
• Flash & EPROM - small, not as fast a DRAM, von-volatile