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diff --git a/laser-tag software/disk.h b/laser-tag software/disk.h
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+++ b/laser-tag software/disk.h
@@ -0,0 +1,100 @@
+/**HEADER********************************************************************
+ * 
+ * Copyright (c) 2008, 2013 - 2014 Freescale Semiconductor;
+ * All Rights Reserved
+ *
+ * Copyright (c) 1989-2008 ARC International;
+ * All Rights Reserved
+ *
+ *************************************************************************** 
+ *
+ * THIS SOFTWARE IS PROVIDED BY FREESCALE "AS IS" AND ANY EXPRESSED OR 
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
+ * IN NO EVENT SHALL FREESCALE OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************
+ *
+ * $FileName: disk.h$
+ * $Version : 
+ * $Date    : 
+ *
+ * Comments:
+ *
+ * @brief The file contains Macro's and functions needed by the disk 
+ *        application
+ *
+ *****************************************************************************/
+
+#ifndef _DISK_H
+#define _DISK_H  1
+
+#include "usb_descriptor.h"
+/******************************************************************************
+ * Constants - None
+ *****************************************************************************/
+
+/******************************************************************************
+ * Macro's
+ *****************************************************************************/
+#define RAM_DISK_APP                        (1)
+#define SD_CARD_APP                         (0)
+
+#if RAM_DISK_APP
+    /* Length of Each Logical Address Block */
+    #define LENGTH_OF_EACH_LAB              (512)    
+    /* total number of logical blocks present */
+    #define TOTAL_LOGICAL_ADDRESS_BLOCKS_NORMAL (4)
+    /* Net Disk Size */
+    #define DISK_SIZE_NORMAL (TOTAL_LOGICAL_ADDRESS_BLOCKS_NORMAL * LENGTH_OF_EACH_LAB)
+#endif
+
+#define LOGICAL_UNIT_SUPPORTED              (1)
+
+#define SUPPORT_DISK_LOCKING_MECHANISM      (0) /*1: TRUE; 0:FALSE*/
+
+#if SD_CARD_APP
+    #define MUTILE_BUFFER                   (1)
+#endif
+#if MUTILE_BUFFER
+    #define MSD_RECV_BUFFER_NUM             (2)
+    #else
+    #define MSD_RECV_BUFFER_NUM             (1)
+#endif
+#define MSD_RECV_BUFFER_SIZE                (512)
+#define MSD_SEND_BUFFER_SIZE                (512)
+/*****************************************************************************
+ * Global variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Types
+ *****************************************************************************/
+typedef struct _disk_variable_struct
+{
+    msd_handle_t app_handle;
+    uint32_t start_app;
+    uint16_t speed;
+#if RAM_DISK_APP
+    uint8_t storage_disk[DISK_SIZE_NORMAL];
+#endif  
+    uint8_t disk_lock;
+    uint8_t read_write_error;
+} disk_struct_t;
+
+/*****************************************************************************
+ * Global Functions
+ *****************************************************************************/
+extern void APP_init(void);
+extern void Disk_App(void);
+
+#endif
+
+/* EOF */