Patent ID: 7753281

Claim:
A method of updating a data file stored on a flash memory device via a contactless communication channel, the method comprising: powering a flash memory device via an RF field generated by a host unit; establishing a contactless communication channel between the flash memory device and the host unit; downloading a first version of a data file from the flash memory device to the host unit via the contactless communication channel, the first version of the data file comprising a first plurality of data chunks; generating a second version of the data file at the host unit, the second version of the data file comprising a second plurality of data chunks; identifying at least one data chunk modification to the first plurality of data chunks necessary to generate the second plurality of data chunks at the host unit; reestablishing the contactless communication channel between the flash memory device and the host unit responsive to the completion of the identification of the at least one data chunk modification to the first plurality of data chunks necessary to generate the second plurality of data chunks; and performing the at least one data chunk modification to the first plurality of data chunks stored on the flash memory device thereby updating the first version of the data file stored on the flash memory device to the second version of the data file.