diff --git a/demo/env/stm32f10x/rtt/components/easyflash/port/ef_port.c b/demo/env/stm32f10x/rtt/components/easyflash/port/ef_port.c
index 8f17ad9..0b9a880 100644
--- a/demo/env/stm32f10x/rtt/components/easyflash/port/ef_port.c
+++ b/demo/env/stm32f10x/rtt/components/easyflash/port/ef_port.c
@@ -143,13 +143,16 @@ EfErrCode ef_port_write(uint32_t addr, const uint32_t *buf, size_t size) {
     FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
     for (i = 0; i < size; i += 4, buf++, addr += 4) {
         /* write data */
-        FLASH_ProgramWord(addr, *buf);
-        read_data = *(uint32_t *)addr;
-        /* check data */
-        if (read_data != *buf) {
-            result = EF_WRITE_ERR;
-            break;
-        }
+		read_data = *(uint32_t *)addr;
+		if (read_data != *buf) {
+			FLASH_ProgramWord(addr, *buf);
+			read_data = *(uint32_t *)addr;
+			/* check data */
+			if (read_data != *buf) {
+				result = EF_WRITE_ERR;
+				break;
+			}
+		}
     }
     FLASH_Lock();
 
diff --git a/easyflash/src/ef_log.c b/easyflash/src/ef_log.c
index e7747a3..bb77363 100644
--- a/easyflash/src/ef_log.c
+++ b/easyflash/src/ef_log.c
@@ -239,7 +239,7 @@ static uint32_t find_sec_using_end_addr(uint32_t addr) {
         return sector_start + EF_ERASE_MIN_SIZE - continue_ff;
     } else {
         /* all sector not has continuous 0xFF, so the sector is full */
-        return sector_start + EF_ERASE_MIN_SIZE;
+        return sector_start + EF_ERASE_MIN_SIZE+LOG_SECTOR_HEADER_SIZE;
     }
 }