Samsung SM-A125W User Manual page 18

Basics
Removing the memory card
Before removing the memory card, first unmount it for safe removal.
Launch the Settings app and tap Battery and 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 Battery and 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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