A data transmission method and apparatus

The present invention relates to computer technology, and in particular relates to a data transmission method and apparatus; to solve since the granularity of data transmission after transmitting the modified data is large, there may be a lot of unnecessary data transmission, resulting in more efficient transmission of data low energy waste problem. The method of the present invention comprises: a host modification instruction receiving data, the data modification instruction includes address information and data information; the host according to the data information, said address information of said buffer pointed to by at least one page is stored means for modifying data, and generates a data write request, wherein each of the data write request comprises the address data cell of each data unit and the identification information of the modified modified; the host transmits the data write request to the memory device, the memory device such that each address according to the modified data unit, each data unit written into the modified memory of the storage device.