Samsung GALAXY S7 User Manual page 296

2. Tap SD card.
The total and available memory space will be displayed.
Format a microSD Card
Formatting a microSD card permanently removes all files stored on the card.
1. From home, tap Apps
2. Tap Storage.
3. Tap More options > Storage settings.
4. Under Portable storage, tap your SD card, and then tap Format > Format.
Settings System Settings
> Settings > Device maintenance .
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