The Motorola Photon (MB855) has both a 3.17GB data partition and 9.56GB of internal phone storage (name called by the phone's file manager) which is what many programs refer to as the SD card. In addition to the internal phone storage there is an external SD card (this is referred to as SD card by the phone's file manager - I have a 16 gb external SD card). The external SD card is not recognized by AirDroid. AirDroid recognizes the 3.17GB data partition as internal storage and the 9.56GB internal phone storage is recognized by AirDroid as the SD card. Other programs (see Titanium Backup) have added external SD card in addition to the SD card.