A refresh register stores disable block information indicating a memory block whose refresh operation is to be disabled. Thus a defective data reproduction resulting from a discontinuity in the data structure of audio frame before and after the dividing position can be avoided. The device comprises a positioning device having a component that is rotatably mounted to a bearing and has a receptacle for receiving and holding the slide, wherein the positioning device is designed such that the slide received in the receptacle can be rotated about an axis of rotation of the rotatably mounted component. The trimming process can be carried out under process conditions where formation of the reaction layer is substantially self-limiting. It is thus possible to provide a medical guide wire that is inexpensive to manufacture and whose strength is unaffected and frictional resistance is low, and manufacturing method for the same. The location key may comprises an acoustic source, a section of fiber optic cable that is acoustically masked, or at least one magnetic field source and step b) comprises using a Lorentz force to establish the location of the magnetic field source with respect to the fiber optic channel.