diff --git a/bsp/bsp_common/fatfs/fatfs_spi_sd.c b/bsp/bsp_common/fatfs/fatfs_spi_sd.c
index 6e8f4d67..457e4936 100644
--- a/bsp/bsp_common/fatfs/fatfs_spi_sd.c
+++ b/bsp/bsp_common/fatfs/fatfs_spi_sd.c
@@ -53,12 +53,12 @@ int sd_disk_ioctl(BYTE cmd, void *buff)
             break;
 
         case GET_SECTOR_SIZE:
-            *(DWORD *)buff = SD_CardInfo.CardBlockSize;
+            *(WORD *)buff = SD_CardInfo.CardBlockSize;
             result = RES_OK;
             break;
 
         case GET_BLOCK_SIZE:
-            *(WORD *)buff = SD_CardInfo.CardBlockSize;
+            *(DWORD *)buff = SD_CardInfo.CardBlockSize;
             result = RES_OK;
             break;
 
diff --git a/bsp/bsp_common/fatfs/fatfs_usb.c b/bsp/bsp_common/fatfs/fatfs_usb.c
index 1428fa9e..b4786fea 100644
--- a/bsp/bsp_common/fatfs/fatfs_usb.c
+++ b/bsp/bsp_common/fatfs/fatfs_usb.c
@@ -60,12 +60,12 @@ int usb_disk_ioctl(BYTE cmd, void *buff)
             break;
 
         case GET_SECTOR_SIZE:
-            *(DWORD *)buff = FLASH_BLOCK_SIZE;
+            *(WORD *)buff = FLASH_BLOCK_SIZE;
             result = RES_OK;
             break;
 
         case GET_BLOCK_SIZE:
-            *(WORD *)buff = 1;
+            *(DWORD *)buff = 1;
             result = RES_OK;
             break;