diff --git a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_Crossworks/Boot/lib/fatfs/mmc.c b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_Crossworks/Boot/lib/fatfs/mmc.c
index f57f4a12..deafc630 100644
--- a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_Crossworks/Boot/lib/fatfs/mmc.c
+++ b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_Crossworks/Boot/lib/fatfs/mmc.c
@@ -372,7 +372,8 @@ typedef struct
 #define SD_SINGLE_BUS_SUPPORT           ((uint32_t)0x00010000)
 #define SD_CARD_LOCKED                  ((uint32_t)0x02000000)
 
-#define SD_DATATIMEOUT                  ((uint32_t)0x00010000)
+
+#define SD_DATATIMEOUT                  ((uint32_t)0xFFFFFFFF)
 #define SD_0TO7BITS                     ((uint32_t)0x000000FF)
 #define SD_8TO15BITS                    ((uint32_t)0x0000FF00)
 #define SD_16TO23BITS                   ((uint32_t)0x00FF0000)
diff --git a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_GCC/Boot/lib/fatfs/mmc.c b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_GCC/Boot/lib/fatfs/mmc.c
index f57f4a12..deafc630 100644
--- a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_GCC/Boot/lib/fatfs/mmc.c
+++ b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_GCC/Boot/lib/fatfs/mmc.c
@@ -372,7 +372,8 @@ typedef struct
 #define SD_SINGLE_BUS_SUPPORT           ((uint32_t)0x00010000)
 #define SD_CARD_LOCKED                  ((uint32_t)0x02000000)
 
-#define SD_DATATIMEOUT                  ((uint32_t)0x00010000)
+
+#define SD_DATATIMEOUT                  ((uint32_t)0xFFFFFFFF)
 #define SD_0TO7BITS                     ((uint32_t)0x000000FF)
 #define SD_8TO15BITS                    ((uint32_t)0x0000FF00)
 #define SD_16TO23BITS                   ((uint32_t)0x00FF0000)
diff --git a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_IAR/Boot/lib/fatfs/mmc.c b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_IAR/Boot/lib/fatfs/mmc.c
index f57f4a12..deafc630 100644
--- a/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_IAR/Boot/lib/fatfs/mmc.c
+++ b/Target/Demo/ARMCM4_STM32_Olimex_STM32E407_IAR/Boot/lib/fatfs/mmc.c
@@ -372,7 +372,8 @@ typedef struct
 #define SD_SINGLE_BUS_SUPPORT           ((uint32_t)0x00010000)
 #define SD_CARD_LOCKED                  ((uint32_t)0x02000000)
 
-#define SD_DATATIMEOUT                  ((uint32_t)0x00010000)
+
+#define SD_DATATIMEOUT                  ((uint32_t)0xFFFFFFFF)
 #define SD_0TO7BITS                     ((uint32_t)0x000000FF)
 #define SD_8TO15BITS                    ((uint32_t)0x0000FF00)
 #define SD_16TO23BITS                   ((uint32_t)0x00FF0000)