Le Galaxy S9 est compatible avec les cartes microSD 2 To !
Amazon.com: Samsung Pro Plus 256GB MicroSD Class 10 UHS-I Memory Card for Samsung Galaxy S20 FE 5G, S20 Ultra, S20, S20+, S10, S9 Phone - MB-MD256KA Bundle with Everything But Stromboli Micro
For Samsung Galaxy S9 G960f G960u S9 Plus S9+g965f G965u Sim Card Reader Tray Micro Sd Memory Card Holder Slot Flex Cable Repair - Mobile Phone Flex Cables - AliExpress
Here is the official spec sheet for the Galaxy S9 and Galaxy S9+ - SamMobile