diff --git a/Makefile b/Makefile
index 1d7c319..648f319 100644
--- a/Makefile
+++ b/Makefile
@@ -247,7 +247,7 @@ qemu: build/harddrive.bin
 	$(QEMU) $(QEMUFLAGS) -drive file=$<,format=raw
 
 qemu_extra: build/harddrive.bin
-	dd if=/dev/zero of=build/extra.bin bs=1G count=8
+	if [ ! -e build/extra.bin ]; then dd if=/dev/zero of=build/extra.bin bs=1M count=1024; fi
 	$(QEMU) $(QEMUFLAGS) -drive file=$<,format=raw -drive file=build/extra.bin,format=raw
 
 qemu_no_build:
diff --git a/programs/coreutils b/programs/coreutils
index 947fffa..c66228c 160000
--- a/programs/coreutils
+++ b/programs/coreutils
@@ -1 +1 @@
-Subproject commit 947fffa181b515ba23210190fc6dcde98aaf9c1c
+Subproject commit c66228c7b069fbffca163dfb64d17b7323c6c269