diff --git a/sw/script/format_disk.sh b/sw/script/format_disk.sh
index 9aed55d..0564b50 100644
--- a/sw/script/format_disk.sh
+++ b/sw/script/format_disk.sh
@@ -13,7 +13,7 @@ sudo mkfs.vfat -F32 $DEVICE -n SUPER6502 $V
 echo
 
 echo "$(tput bold setaf 11)Modifying Boot Sector$(tput sgr 0)"
-sudo dd if=$BOOTLOADER of=$DEVICE bs=512 count=1 $STATUS
+sudo dd if=$BOOTLOADER of=$DEVICE bs=446 count=1 $STATUS
 
 echo "$(tput bold setaf 10)Done!$(tput sgr 0)"