1. Click **Windows-E** to open the computer window. Right-click your Micro SD card in the window and choose **Format**. Before proceeding any further, make sure you've copied or moved everything off the card that you want to keep. Reformatting a card wipes its contents.
2. Pick **FAT32** from the File System menu.
3. Leave the other options set to default except for **Quick Format**, which you can optionally uncheck. Quick formatting a Micro SD card takes less time, but may not be able to detect problems with your Micro SD card. Unless you're in a hurry, uncheck the option to run the check and make sure your card is in good condition. Finally, click **Start** to begin the reformat.
4. Click **OK** to confirm that you've copied your files off the card and proceed with the format.
- Mac OS
1. Search for Disk Utility in Launchpad and open it.
2. Select the Drive and click Erase.
3. Select MS-DOS (FAT) for Format.
4. Select Master Boot Record for Scheme.
5. Click Erase. (Depending on the USB drive size, the operation might take some time.)