diff --git a/stress-tests/stress-tests.sh b/stress-tests/stress-tests.sh
index 2031bcb..f6f49f6 100755
--- a/stress-tests/stress-tests.sh
+++ b/stress-tests/stress-tests.sh
@@ -13,10 +13,9 @@ for dev in /dev/mmcblk? /dev/sd?; do
 done
 
 # I/O load (USB read/write)
-if mount | grep /mnt/pendrive >/dev/null; then
+if mount | grep -q /mnt/pendrive; then
     if [ -e /mnt/pendrive/file.tar ]; then
         cd /mnt/pendrive
-        tar -cf file.tar -C /var/log --exclude=lost+found -p .
         while true; do rm -rf output; mkdir -p output; tar xfv file.tar -C output/ >/dev/null 2>&1; done &
     else
         echo "Warning: Archive file.tar not found in /mnt/pendrive. USB read/write stress test will not run."