Methods and devices for improving measurements of test meter, and in particular for detecting a presence of an electrochemical sensor or strip in the test meter and a start time of an electrochemical reaction, are provided. The d\xe9cor includes d\xe9cor items, e. The impeller may comprise a plurality of blades, arranged in blade rows, to facilitate radial compression of the blades. Results corresponding to the request are received from the identity module, and are transmitted to the application. A program for managing the storage system controls a computer to execute the procedures of: identifying any one of the plurality of programs; identifying a first volume that the identified program uses; obtaining every second volume set in a pair state with the first volume; and summarizing the first volume and the obtained second volume for the identified program. The method allows accurate forming of pre-determined pattern at high production speed.