diff --git a/create_testfiles.sh b/create_testfiles.sh
index 6b31d9f..18a7539 100755
--- a/create_testfiles.sh
+++ b/create_testfiles.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 
-dd if=/dev/urandom of=test1.txt bs=1000000 count=10
+scdd if=/dev/urandom of=test1.txt bs=1000000 count=10
 dd if=/dev/urandom of=test2.txt bs=1000000 count=100
 dd if=/dev/urandom of=test3.txt bs=1000000 count=1000
+cat test3.txt test3.txt test3.txt test3.txt test3.txt test3.txt test3.txt test3.txt test3.txt test3.txt > test4.txt