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* Level 2 (L2) [[CPU cache|cache]] – higher latency than L1 by 2× to 10×, often 512KB or more
* Level 3 (L3) [[CPU cache|cache]] – (optional) higher latency than L2, often multiple MB's
* [[Primary storage|Main memory]] ([[DRAM]]) – may take hundreds of cycles, but can be multiple gigabytes. Access times may not be uniform, in the case of a NUMA machine.
* [[Disk storage]] – hundreds of thousands of cycles latency, but very large
* [[Tertiary storage]] – tape, optical disk (WORM)
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