What Is an Slot and What Devices Use the Slot?

Hi @iridi , It does not have a slot but according to the service manual it has a PCIe slot for either a half mini WAN card OR a mSATA

2 SSD , such as a Samsung 950 Pro or Samsung SM 951, to a PC with an available x4 PCI Express expansion slot You can mount the PCIe drive

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m2 slot types Buy M2 for KEY A E to M2 NVME Adapter Card M2 NVME to KEY-M Expansion Slot WIFI in at