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diff --git a/arduino/libraries/FileSystem/examples/Internal_ReadWrite/Internal_ReadWrite.ino b/arduino/libraries/FileSystem/examples/Internal_ReadWrite/Internal_ReadWrite.ino
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index 0000000..b5eed85
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+++ b/arduino/libraries/FileSystem/examples/Internal_ReadWrite/Internal_ReadWrite.ino
@@ -0,0 +1,80 @@
+/*********************************************************************
+ This is an example for our nRF52 based Bluefruit LE modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+#include <Bluefruit_FileIO.h>
+
+#define FILENAME    "/adafruit.txt"
+
+#define CONTENTS    "Bluefruit Feather52's file contents"
+
+File file(InternalFS);
+
+// the setup function runs once when you press reset or power the board
+void setup() 
+{
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);   // for nrf52840 with native usb
+
+  Serial.println("Internal Read Write File Example");
+  Serial.println();
+
+  // Wait for user input to run. Otherwise the code will 
+  // always run immediately after flash and create the FILENAME in advance
+  Serial.print("Enter to any keys to continue:");
+  while ( !Serial.available() )
+  {
+    delay(1);
+  }
+  Serial.println();
+  Serial.println();
+
+  // Initialize Internal File System
+  InternalFS.begin();
+
+  file.open(FILENAME, FILE_READ);
+
+  // file existed
+  if ( file )
+  {
+    Serial.println(FILENAME " file exists");
+    
+    uint32_t readlen;
+    char buffer[64] = { 0 };
+    readlen = file.read(buffer, sizeof(buffer));
+
+    buffer[readlen] = 0;
+    Serial.println(buffer);
+    file.close();
+  }else
+  {
+    Serial.print("Open " FILENAME " file to write ... ");
+
+    if( file.open(FILENAME, FILE_WRITE) )
+    {
+      Serial.println("OK");
+      file.write(CONTENTS, strlen(CONTENTS));
+      file.close();
+    }else
+    {
+      Serial.println("Failed!");
+    }
+  }
+}
+
+// the loop function runs over and over again forever
+void loop() 
+{
+  digitalToggle(LED_RED);
+  delay(1000);
+}