public static void walkFreeList( String[] args)
throws Throwable
{
DiskAllocator da=new DiskAllocator( new File( args[0]));
System.out.println( args[0]+" free:");
da.walkInternalFreeList( System.out);
System.out.println( args[0]+" used:");
da.walkRegions( System.out);
da.close();
}