A method for quickly identifying data residing on a volume in a multivolume file system. The wound electrode battery is then inserted inside a battery can. The memory device does not perform any error correction code algorithm nor provide designated error correction code storage for the N-bit block of data. The therapeutic substance reservoir is configured to contain a therapeutic substance and is coupled to the housing. The fixation device can further include an insertion instrument configured to implant the fixation device into an anatomical cavity.