To prevent a possible loss of data on the memory card, the memory card should be logged off or ejected from the system before removing it.

Android 9
How to Unmount SD Card -  Open the  Settings
How to Unmount SD Card -  Tap on  Storage
How to Unmount SD Card -  Tap on  Unmount
  1. Open the Settings
  2. Tap on Storage
  3. Tap on Unmount

Android Instructions
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