Samsung Galaxy Note 9 User Manual page 207

Remove a memory card
Warning: To prevent damage to information stored
on the memory card, unmount the card before
removing it from the device.
1. From Settings, tap Device maintenance >
Storage.
2. Tap More options > Storage settings.
3. Under Portable storage, tap your SD card, and
then tap Unmount.
4. Remove your memory card from the device.
Settings
Format a memory card
Warning: When formatting an SD card, you should
back up your music and photo files that are stored
on the card because formatting the SD card deletes
all the stored data.
1. From Settings, tap Device maintenance >
Storage.
2. Tap More options > Storage settings.
3. Under Portable storage, tap your SD card, tap
Format, and then follow the prompts.
165