anchor.diff:      ok = disk_log:close(n),
       {ok, n} = disk_log:open([{name, n}, {file, File}, {type, halt},
   			     {format, internal}, {mode, read_only}]),
  -    crash(File, 44), % the binary term {s} is now bad
  -    {J11, [{this,is}], 7} = disk_log:chunk(n, start, 10),
  +    crash(File, 40), % the binary term {s} is now bad
  +    {J11, [{this,is}], 6} = disk_log:chunk(n, start, 10),
       {J21, [{on,a},{halt,file}]} = disk_log:chunk(n, J11),
       eof = disk_log:chunk(n, J21),
       ok = disk_log:close(n),
  
positive.code:     ok = disk_log:close(n),
      BadFile = add_ext(File, 2), % current file
      set_opened(BadFile),
      crash(BadFile, 28), % the binary is now invalid
      {repaired,n,{recovered,0},{badbytes,26}} =
  	disk_log:open([{name, n}, {file, File}, {type, wrap},
  		       {format, internal}, {size, {40,No}}]),
      ok = disk_log:close(n),
  
negative.code:     ok = disk_log:close(n),
      {ok, n} = disk_log:open([{name, n}, {file, File}, {type, halt},
  			     {format, internal}, {mode, read_only}]),
      crash(File, 46), % the binary term {some,terms} is now bad
      {J1, [{this,is}], 16} = disk_log:chunk(n, start, 10),
      {J2, [{on,a},{halt,file}]} = disk_log:chunk(n, J1),
      eof = disk_log:chunk(n, J2),
      ok = disk_log:close(n),
  