Patent ID: 6973472

Claim:
A data synchronization system which is implemented in a handheld electronic device and a desktop computer, wherein the handheld electronic device includes a first data block, the desktop computer includes a second data block, and a first data format of a first data stored in the first data block and a second data format of a second data stored in the second data block include a common format section respectively, the data synchronization system comprises: a first memory device in the handheld electronic device to store a first modification record of the first data block; a second memory device in the desktop computer to store a second modification record of the second data block; and a synchronization program installed in the desktop computer, which updates the first and second data blocks according to the first and the second modification records, and transmits only the contents of the common format section while transmitting one of the first data and the second data between the handheld electronic device and the desktop computer.