an extended storage is temporarily used for the dedicated use by a batch process to eliminate the contention of resources between an online process and the batch process and attain a high speed batch process while the online process is executed without affecting the online process . the online process is executed by inputting data from a file to a main storage , and the batch process updates the data on the extended storage in parallel with the online process . since the accessing device for the online process and the batch process are different , there is no contention of resources . when the batch process is completed , the updated data is reloaded from the extended storage to the file . during the reloading of the updated data , the online process inputs the data from the extended storage . the extended storage is shared by the reloading of the updated data and the online process , but the contention of resources does not occur because both are input processes and the extended storage is a storage device which does not includes a mechanical movement unlike a magnetic disk drive .