make reset multithreaded and shorter

reset.sh

@@ -1,6 +1,9 @@
 #!/bin/bash
 
 for device in /dev/md* /dev/nvme* /dev/sd* /dev/vd*; do
-    dd if=/dev/zero of=$device bs=10M count=100
+    dd if=/dev/zero of=$device bs=10M count=10 &
 done
-sync
+
+wait
+
+sync