really really clean a disk

reallycleandisk.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/bash 
+set -x
+
+DISK=${1:-nodisk}
+
+if [ "x${DISK}" = "xnodisk" ]; then
+  echo "What disk ? (sda, sdb, nvme0n1,...)"
+  exit 1
+fi
+
+SIZE=$(sudo blockdev --getsz /dev/${DISK})
+PBSZ=$(sudo blockdev --getpbsz /dev/${DISK})
+SEEK=$(($SIZE - 256 * 1024 * 2 / $PBSZ)) 
+LEN=$((256 *2 *1024 /$PBSZ))	
+# SEEK=$(( $(sudo blockdev --getsz "/dev/sdX1") -  256 * 1024 * 2 / $(sudo blockdev --getpbsz "/dev/sdX1")))
+echo $SIZE $PBSZ $SEEK $LEN
+for i in 1 2 3 4 ; do
+  TOWIPE=${DISK}${i}
+  if [ -b /dev/$TOWIPE ] ; then
+    sudo wipefs -a -f /dev/${TOWIPE}
+    sudo  dd if=/dev/zero of=/dev/${TOWIPE} bs=$PBSZ count=$LEN 
+    sudo  dd if=/dev/zero of=/dev/${TOWIPE} seek=$SEEK bs=$PBSZ count=$LEN 
+  fi
+done
+
+
+
+sudo wipefs -a -f /dev/${DISK}
+sudo  dd if=/dev/zero of=/dev/${DISK} bs=$PBSZ count=$LEN 
+sudo  dd if=/dev/zero of=/dev/${DISK} seek=$SEEK bs=$PBSZ count=$LEN