MSI S1206 User Manual page 16

M2_1, M2_2: M.2 Slot (M Key, PCIe 3.0 x2, 2280)
The M.2 slot supports solid-state drive (SSD). For Installation procedure, please refer
to "System Setup > M.2 M Key".
MSD1, MSD2: Micro SD Card Slot
This slot is for inseriting the micro SD card.
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Motherboard Connector