Micro SD cards can be formatted just like a computer hard drive.
When you buy a SanDisk micro SD card, it will be formatted properly. However, there are times when you want to erase everything on the card or possibly eliminate errors you might see when using the card. Formatting the card can be done with any computer that has an external or internal card reader, and it takes less than a minute to return your card to like-new condition.
Instructions
Formatting on a Computer
1. Insert the tiny micro SD card into slot located at the bottom of the the larger SD card adapter. If you are using an external card reader, plug the card reader into your computer.
2. If the Plug and Play menu opens, close it. Right-click on "Start" and select "Open Windows Explorer."
3. Right-click on your card. It should be listed in the pane on the left.
4. Select "Format."
5. Select any preferences you want to set, such as what file system type, and then begin the formatting process.
Formatting With a Cellphone
6. Insert the Sandisk micro SD card into the card slot on your cellphone. The card slots on some older micro SD-enabled phones is behind the phone's battery. Power your phone down before removing the battery.
7. Hit your phone's menu button. In the menu, locate the "Settings" or "Setting and Tools" option. Browse the "Settings" menu for the "Memory" or "Phone Storage" option.
8. Locate the "Card Memory" option and then choose the format option to erase the SD card.
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