Problem with storage write to pos 0

Supporting size again did not help.
I've a different hack ;-)

I'm using Storage to save some images data from GraphicsBuffer.
Creating the file was seperated from writing data.

//initialization of file storage
var st = require("Storage");
var fn = "b";
st.write(fn,'X',0,1024);
......
......
//write data to file
for(y = 0; y < height; y++){
  st.write(fn,data_for_one_line,y * width);  // write one line of graphics data
}

My hack is to remove write in initialization, and add size to write of first line.