title: Changing a partition with fdisk shows a warning like "partition#x contains ext4-signature"
body: <p>I'm shrinking a partion size with </p>
  
  <pre><code>#Reduce Partition Size
  fsck -f /dev/sdb2
  resize2fs /dev/sdb2 -M -p
  
  #Limit Partion
  fdisk /dev/sdb
  ... #Now I'm changing the Partition 2 to the new (smaller) size
  </code></pre>
  
  <p>fdisk gives me a (red) warning like <code>partition#2 contains ext4-signature</code> (<code>Partition #2 enthält eine ext4-Signatur</code>)</p>
  
  <p>Is there something wrong? Why does the fdisk show me a warning?</p>