diff --git a/hal/src/SdCardHal.cpp b/hal/src/SdCardHal.cpp
index 42411ae..000edd4 100644
--- a/hal/src/SdCardHal.cpp
+++ b/hal/src/SdCardHal.cpp
@@ -65,6 +65,12 @@ StatusCode SdCardHal::GetCapacity(unsigned long long &totalSizeMB, unsigned long
     LogInfo("Used size: %llu MB\n", usedSizeMB);
     return CreateStatusCode(STATUS_CODE_OK);
 }
+/**
+ * @brief To format an SD card, you normally need to unmount the SD card before formatting it. However, when the SD card
+ * is abnormal (usually it cannot be mounted or unmounted), you still need to execute the format command operation,
+ * because some cards can be restored to normal by formatting when they are abnormal.
+ * @return StatusCode
+ */
 StatusCode SdCardHal::FormatSDCard(void)
 {
     UnInit();
@@ -221,7 +227,7 @@ void SdCardHal::UnmountSdCard(void)
      * card node to be occupied and cannot be loaded. To find problems and optimize them, it is especially important to
      * check whether there are any omissions.
      */
-    sprintf(command, "umount -fl %s", SD_CARD_MOUNT_PATH);
+    sprintf(command, "umount -fl %s", SD_CARD_DEVICE);
     int ret = fx_system(command);
     if (ret != 0) {
         LogError("Format sd card failed [%s].\n", SD_CARD_DEVICE);