anchor.diff:  %%----------------------------------------------------------------------
   
   expand(Fd, Bytes) when Bytes > 0 ->
  -    gen_server:call(Fd, {expand, Bytes}).
  +    gen_server:call(Fd, {expand, Bytes}, infinity).
   
   
   %%----------------------------------------------------------------------
  
positive.code: %%----------------------------------------------------------------------
  
  pwrite(Fd, Pos, Bin) ->
      gen_server:call(Fd, {pwrite, Pos, Bin}).
  
  %%----------------------------------------------------------------------
  %% Purpose: To append a segment of zeros to the end of the file.
  
negative.code: 
  % length in bytes
  bytes(Fd) ->
      gen_server:call(Fd, bytes, infinity).
  
  %%----------------------------------------------------------------------
  %% Purpose: Truncate a file to the number of bytes.
  