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Make sure your Android's SD card is in place. Open your Android's Settings . Scroll down and tap Storage. Tap your microSD card's name. Tap ⋮. Tap Storage settings. Tap Format or Format as internal. Tap ERASE & FORMAT.
If you need to insert the SD card, you may need to remove the back from your Android.  Tablets and phones use microSD cards, which are miniature versions of the SD cards found in cameras and such. In some cases, you'll need to remove the battery from your Android as well before you can access the SD slot. It's a gear-shaped app in your Android's App Drawer. You'll find this option about halfway down the Settings page. On a Samsung device, tap Device maintenance. It should be below the "Portable storage" heading. This option is in the top-right corner of the screen. It's at the bottom of the drop-down menu. If you want to set up your SD card as an internal storage option, tap Format as internal. If you're simply attempting to erase your SD card, tap Format. You may first have to tap Storage at the bottom of the page on a Samsung device. It's at the bottom of the page. Doing so will begin formatting your SD card for your Android device. This process should only take a few seconds. Once it's complete, your SD card has successfully been reformatted.