Non-Volatile Memory Express (NVMe) is a high-performance protocol that defines how a system reads from and writes to non-volatile solid-state storage over PCIe. Because it is a protocol (logical interface), it can be implemented on drives that use various physical form factors and connectors such as M.2, U.2, or add-in PCIe cards. M.2, by contrast, is merely a physical form-factor specification, not a storage protocol, so the two are not directly comparable.
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