The present invention is to provide a method of storing data for driving an MMC or SD under an operating system (e.g., Linux), which comprises the steps of collecting data in a plurality of discreet blocks of a high-speed buffer for each writing request made by a device driver under the OS; temporarily storing data in a plurality of continuous blocks of another buffer; and writing data from the continuous blocks of another buffer into a continuous block of the MMC or the SD in one operation in the form of multiple blocks in due time. By utilizing this method, data writing speed is significantly increased.