Directories in a file system are defined with a dummy cluster in a file allocation table as the initial entry. The cabinet bracket includes a pair of slots that include detent portions. Said at least one capacitive branch and said at least one resonant branch are connected in parallel, and said tuning application means are adapted for application of a DC tuning voltage. This permits an umpire to easily determine whether or not the baseball laterally passed through the strike zone and call the pitch a ball or a strike accordingly.