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SSDs are significantly faster than HDDs, and they come in many different formats. You can get an M2 or a SATA SSD, and one M2 SSD can use a different generation of PCIe technology to another.

2 Double Standing Plus" cradle (model: CROSMDSP10G). This handy device is designed to support one SATA SSD or HDD and two M.2 NVMe SSDs, allowing users to manage multiple storage devices at once.

Such is the case with the Lenovo ThinkPad 13 — it’s got a M.2 M-key socket, yet somehow only supports SATA SSDs in it, despite the CPU being new enough to support both SATA and NVMe effortlessly.