Program to check CP/M diskettes or hard drives to find bad records
and lock out any found.  Creates an [UNUSED].BAD file on any user
area specified (defaults to user 0.)  Checks system tracks if same
density as information tracks.  Does not name any involved files if a
few bad sectors are found.  This version permits using FBAD B: or
FBAD B or just FBAD to use on the current drive.  Can check numerous
diskettes consecutively by just typing 'C' to start the next one.