diff --git a/filldev b/filldev
index ddf85f9..552b412 100755
--- a/filldev
+++ b/filldev
@@ -17,6 +17,6 @@ ${SEC} && echo "random data" || echo "zeros"
 
 for DEV in "${DVC[@]}"; do
   echo "${DEV}:"
-  ${SEC} && openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | sudo dd of=${DEV} bs=4M status=progress
-  ${SEC} || sudo dd if=/dev/zero of=${DEV} bs=4M status=progress
+  ${SEC} && openssl enc -aes-256-ctr -pbkdf2 -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | sudo dd of=${DEV} bs=4M conv=notrunc status=progress
+  ${SEC} || sudo dd if=/dev/zero of=${DEV} bs=4M conv=notrunc status=progress
 done