Windows Phone 8 supports SDHC cards (in FAT file system format) or SDXC (in exFAT file system format):
- Up to 32-GB SDHC cards using the FAT file system.
- 64-GB SDXC cards using the exFAT file system.
If the card is unformatted, or if the card contains an unsupported format such as NTFS, the system formats the SD card according to the SD specification if the user accepts the change at a format prompt.
The internal user store is formatted in NTFS file system format.