title: dd command error writing No space left on device
body: <p>I am new to storage, trying to erase the data in the device <code>'/dev/sdcd'</code> why should I get 'No space left error'</p>
  
  <pre><code>[root@ dev]# dd if=/dev/zero of=/dev/sdcd bs=4k
  dd: error writing ‘/dev/sdcd’: No space left on device
  1310721+0 records in
  1310720+0 records out
  5368709120 bytes (5.4 GB) copied, 19.7749 s, 271 MB/s
  [root@ dev]# ls -l /dev/null
  crw-rw-rw-. 1 root root 1, 3 Oct 27 01:35 /dev/null
  </code></pre>
  
  <p>if this is very basic question,  I am sorry about that</p>