diff --git a/include/rtdef.h b/include/rtdef.h
index 75bc7e57d75d7e416c8f617305c3a7fd95ca612b..1c504ce18abb8da54dacedb5b321233b73fe1d8d 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -692,6 +692,7 @@ enum rt_device_class_type
 #define RT_DEVICE_CTRL_CHAR_STREAM      0x10            /**< stream mode on char device */
 #define RT_DEVICE_CTRL_BLK_GETGEOME     0x10            /**< get geometry information   */
 #define RT_DEVICE_CTRL_BLK_SYNC         0x11            /**< flush data to block device */
+#define RT_DEVICE_CTRL_BLK_ERASE		0x12 			/**< erase block on block device */
 #define RT_DEVICE_CTRL_NETIF_GETMAC     0x10            /**< get mac address */
 #define RT_DEVICE_CTRL_MTD_FORMAT       0x10            /**< format a MTD device */
 #define RT_DEVICE_CTRL_RTC_GET_TIME     0x10            /**< get time */
@@ -743,6 +744,15 @@ struct rt_device_blk_geometry
     rt_uint32_t block_size;                             /**< size to erase one block */
 };
 
+/**
+ * sector arrange struct on block device
+ */
+struct rt_device_blk_sectors
+{
+	rt_uint32_t sector_begin;							/**< begin sector */
+	rt_uint32_t sector_end;								/**< end sector   */
+};
+
 /**
  * graphic device control command
  */