diff --git a/examples/file/listdir.c b/examples/file/listdir.c
index 86279163e5646a7e92deb91e7b0d9234c9f1bb37..76cf2f2e26575f14cecec75125225c306045019a 100644
--- a/examples/file/listdir.c
+++ b/examples/file/listdir.c
@@ -14,6 +14,7 @@
 #include <rtthread.h>
 #include <dfs_posix.h>
 
+static char fullpath[256];
 void list_dir(const char* path)
 {
 	DIR *dir;
diff --git a/examples/file/readspeed.c b/examples/file/readspeed.c
index 5d2275636545a63a6ae2bbb85ac0d190d60fe15b..2426756fabc120c9a42cc0295d6dee0d5827fd3b 100644
--- a/examples/file/readspeed.c
+++ b/examples/file/readspeed.c
@@ -22,7 +22,7 @@ void readspeed(const char* filename, int block_size)
     rt_size_t total_length;
     rt_tick_t tick;
 
-    fd = open(filename, 0, DFS_O_RDONLY);
+    fd = open(filename, 0, O_RDONLY);
     if (fd < 0)
     {
         rt_kprintf("open file:%s failed\n", filename);
@@ -45,7 +45,7 @@ void readspeed(const char* filename, int block_size)
         int length;
         length = read(fd, buff_ptr, block_size);
 
-        if (length == 0) break;
+        if (length <= 0) break;
         total_length += length;
     }
     tick = rt_tick_get() - tick;
diff --git a/examples/file/readwrite.c b/examples/file/readwrite.c
index b4086cf05673486523d4182fb0ef45987432310b..8dc29837ef921b07b4355caffd7bc5c60b485958 100644
--- a/examples/file/readwrite.c
+++ b/examples/file/readwrite.c
@@ -14,18 +14,105 @@
 #include <rtthread.h>
 #include <dfs_posix.h>
 
+#define TEST_FN		"/test.dat"
+
+static char test_data[120], buffer[120];
+
 /* 文件读写测试 */
 void readwrite(const char* filename)
 {
 	int fd;
+	int index, length;
+
+	/* 只写 & 创建 打开 */
+	fd = open(TEST_FN, O_WRONLY | O_CREAT | O_TRUNC, 0);
+	if (fd < 0)
+	{
+		rt_kprintf("open file for write failed\n");
+		return;
+	}
+
+	/* 准备写入数据 */
+	for (index = 0; index < sizeof(test_data); index ++)
+	{
+		test_data[index] = index + 27;
+	}
 
-	/* 只写打开 */
+	/* 写入数据 */
+	length = write(fd, test_data, sizeof(test_data));
+	if (length != sizeof(test_data))
+	{
+		rt_kprintf("write data failed\n");
+		close(fd);
+		return;
+	}
+
+	/* 关闭文件 */
+	close(fd);
 
 	/* 只写并在末尾添加打开 */
+	fd = open(TEST_FN, O_WRONLY | O_CREAT | O_APPEND, 0);
+	if (fd < 0)
+	{
+		rt_kprintf("open file for append write failed\n");
+		return;
+	}
+
+	length = write(fd, test_data, sizeof(test_data));
+	if (length != sizeof(test_data))
+	{
+		rt_kprintf("append write data failed\n");
+		close(fd);
+		return;
+	}
+	/* 关闭文件 */
+	close(fd);
 
 	/* 只读打开进行数据校验 */
+	fd = open(TEST_FN, O_RDONLY, 0);
+	if (fd < 0)
+	{
+		rt_kprintf("check: open file for read failed\n");
+		return;
+	}
+
+	length = read(fd, buffer, sizeof(buffer));
+	if (length != sizeof(buffer))
+	{
+		rt_kprintf("check: read file failed\n");
+		close(fd);
+		return;
+	}
+	for (index = 0; index < sizeof(test_data); index ++)
+	{
+		if (test_data[index] != buffer[index])
+		{
+			rt_kprintf("check: check data failed at %d\n", index);
+			close(fd);
+			return;
+		}
+	}
 
-	/* lseek测试，读出并校验数据 */
+	length = read(fd, buffer, sizeof(buffer));
+	if (length != sizeof(buffer))
+	{
+		rt_kprintf("check: read file failed\n");
+		close(fd);
+		return;
+	}
+	for (index = 0; index < sizeof(test_data); index ++)
+	{
+		if (test_data[index] != buffer[index])
+		{
+			rt_kprintf("check: check data failed at %d\n", index);
+			close(fd);
+			return;
+		}
+	}
+	/* 检查数据完毕，关闭文件 */
+	close(fd);
+	/* 打印结果 */
+	rt_kprintf("read/write done.\n");
 }
 
 #ifdef RT_USING_FINSH
diff --git a/examples/file/writespeed.c b/examples/file/writespeed.c
index d829d9977bae991ced0ca3edc7f75fbb7ad771d4..22b6d565d2382d52bdf07e2c510db98f33ae8eaf 100644
--- a/examples/file/writespeed.c
+++ b/examples/file/writespeed.c
@@ -16,11 +16,11 @@
 
 void writespeed(const char* filename, int total_length, int block_size)
 {
-    int fd;
+    int fd, index, length;
     char *buff_ptr;
     rt_tick_t tick;
 
-    fd = open(filename, 0, O_WRONLY);
+    fd = open(filename, O_WRONLY | O_WRONLY | O_TRUNC, 0);
     if (fd < 0)
     {
         rt_kprintf("open file:%s failed\n", filename);
@@ -37,9 +37,25 @@ void writespeed(const char* filename, int total_length, int block_size)
     }
 
 	/* prepare write data */
+	for (index = 0; index < block_size; index++)
+	{
+		buff_ptr[index] = index;
+	}
+	index = 0;
 
+	/* get the beginning tick */
     tick = rt_tick_get();
-
+	while (index < total_length / block_size)
+	{
+		length = write(fd, buff_ptr, block_size);
+		if (length != block_size)
+		{
+			rt_kprintf("write failed\n");
+			break;
+		}
+		
+		index ++;
+	}
     tick = rt_tick_get() - tick;
 
 	/* close file and release memory */