A method for storing data includes designating, in a memory array including cells configured for writing a first number of bits per cell, a group of the cells to which input data are to be written at a second number of bits per cell, smaller than the first number. The cover can be coupled to the housing so that it can move between a closed position within the housing’s surface recess and an open position that allows access to the opening in the housing. An arrangement for grouping into subgroups objects from the group of objects is selected. Using a PC card thus configured makes it possible to readily configure a positioning system having a plurality of absolute sensors.