An Eyefi Mobi card may be formatted like any other memory card. Formatting will not delete any of your photos already uploaded to your mobile device, Eyefi Cloud, or any wireless network settings, but it will delete any photos on the card. We recommend formatting in an Eyefi Compatible camera, if possible.
If you format your Eyefi Mobi in a computer, please use a USB card reader with a single SD card slot. We do not recommend using a third-party card reader with slots for multiple types of memory cards (such as SD and CompactFlash in one reader). The SD Association offers free software to format SD cards in computers, which we recommend using to format your Eyefi Mobi card.