Hi @Stewy69 Fishtowns answer is absolutely correct. An additional information about the one M.2 Slot: It contains the boot Phison PCIe M.2; but it could also handle a SATA M.2 SSD. But of course the built in PCIe is faster. The second M.2 socket is for WiFi only (an E-key) For space look at the pictures in this thread, it is from the inner view almost identical with your PC. You can fix a 3.5 or 2.5 HDD or SSD in the predrilled holes at the bottom. Or tape it to the bottom with a double-sided adhesive tape. Or make a stack with two or three disks on top of each other with little wooden sticks for distance for ventilation inbetween. Cheers, daddle
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