Data transfer system and method thereof

A data transfer system, comprising:

• a data transmitting device, comprising:
• a transmitting storage device, configured to store a file;
• a transmitting processor, configured to generate a transmitting index of the file using a transmitting data block and a size of the file;
• and
• a transmitting transceiver, configured to transmit the transmitting index;
• a data receiving device, comprising:
• a receiving data transceiver, configured to receive the transmitting index from the transmitting transceiver;
• a receiving storage device, configured to store a plurality of receiving files and a plurality of receiving indexes respectively representing the plurality of receiving files;
• and
• a receiving processor, configured to confirm if the transmitting index matches one of the plurality of receiving indexes, and configured to respond a result of confirming a match of the transmitting index to the data transmitting device via the receiving transceiver;
• wherein the data transmitting device is further configured to transfer the file to the data receiving device via the transmitting transceiver and the receiving transceiver when the result of confirming the transmitting index indicates that the transmitting index matches none of the plurality of receiving indexes.