Abstract: A method of data reading and writing includes the following steps: when a service routine is called by a local device to execute an action of reading in a floppy disk drive or a CD-ROMdrive, the service routine will cancel the original action of accessing the local device, redirect the accessing command and related data, send a network packet including the redirected accessing command and inputted data to the remote device afterwards. Then, the agent program in the remote device will access the remote storage medium according to the received accessing command and related data, and transfer the requested data back to the local device to proceed with a booting procedure or to execute related programs under DOS.