Samsung Galaxy Tab Active3 User Manual page 24

Basics
Removing the memory card
Before removing the memory card, first unmount it for safe removal.
Launch the Settings app and tap Device care → Storage → Advanced → SD card →
Unmount.
Do not remove external storage, such as a memory card or USB storage, while the
device is transferring or accessing information, or right after transferring data. Doing
so can cause data to be corrupted or lost or cause damage to the external storage or
device. Samsung is not responsible for losses, including loss of data, resulting from
the misuse of external storage devices.
Formatting the memory card
A memory card formatted on a computer may not be compatible with the device. Format the
memory card on the device.
Launch the Settings app and tap Device care → Storage → Advanced → SD card →
Format.
Before formatting the memory card, remember to make backup copies of all
important data stored in the memory card. The manufacturer's warranty does not
cover loss of data resulting from user actions.
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