code: function writeStringToFS(target, string, callback) {
  		var byteArray = new Uint8Array(string.length);
  		for (var i=0; i<byteArray.length; i++) {
  			byteArray[i] = string.charCodeAt(i) & 0xff;
  		}
  		writeByteArrayToFS(target, byteArray, callback);
  	}
docs: transfer image