diff --git a/idd.sh b/idd.sh
index 51dddea..cbf8795 100755
--- a/idd.sh
+++ b/idd.sh
@@ -127,7 +127,7 @@ case "$1" in
      echo
      printf "${LCYAN}Please wait ...${NC}\n"
      echo
-     pv -tpreb ${filepath} | dd of=${DEVICEDIR}/${devname};sync
+     pv -tpreb ${filepath} | dd bs=4M of=${DEVICEDIR}/${devname};sync
      printf "${LGREEN}Done writing file${NC}\n"
   else
      echo "${0}: Please install 'pv' with your package manager"
@@ -177,7 +177,7 @@ case "$1" in
       echo
       printf "${LCYAN}Please wait ...${NC}\n"
       echo
-      pv -tpreb ${filepath} | dd of=${DEVICEDIR}/${devname};sync
+      pv -tpreb ${filepath} | dd bs=4M of=${DEVICEDIR}/${devname};sync
       printf "${LGREEN}Done writing file${NC}\n"
     else
       echo "${0}: pv command not found in /usr/bin"