Cannot find the hard disk drive or SSD after motherboard

Which Slot to use? m 2 drive slot 2 it would be NVMe compatible instead, what came before was usually mSATA or miniPCIe drives NGFF replaced this and unified it And m24 slot SSD is 22mm x 42mm in dimensions slots on motherboards and other devices do not support all SSD sizes The standard is based on the

m2 expansion slot SIM Slot x 2 Indicator, Power LED x 1 OS support, Linux (NVIDIA JetPack 2280 M-Key x 1 SATA Drive Bay x 1, 2280 M-Key x