If reformatting is needed, follow the steps below WARNING Backup all your data before formatting Formatting will erase all data on the memory device Formatting your memory device 1 Doubleclick My Computer, or Computer (for Vista and Win7) 2 Rightclick the drive letter associated with your memory device, then select Format SDHC cards only come in sizes up to 32GB Anything larger than 32GB in a Secure Digital Form factor (or Micro SD form factor) is going to be an SDXC card instead of an SDHC card, and will be formatted as exFAT (versus FAT32) by default You'll also need to be using an Operating System that includes drivers for the exFAT file system type to useAn unformatted micro SD card is still available for data storage after formatting, so you can format the SanDisk Ultra 64GB micro SD card to fix the not formatted error when data is recovered You can format the microSD card by inserted it to your Nokia mobile phone, but it will be better if you format it on your computer
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