Samsung Galaxy Book 12 User Manual page 18

Basics
1
Insert the ejection pin into the hole on the tray to loosen the tray.
Ensure that the ejection pin is perpendicular to the hole. Otherwise, the device may
be damaged.
2
Pull out the tray gently from the tray slot.
When you remove the tray from the device, the mobile data connection will be
disabled.
3
Place a memory card on the tray with the gold-coloured contacts facing downwards.
4
Gently press the memory card into the tray to secure it.
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