title: Virtualbox Mac OSX 10.11 Guest OS Corrupted Hard Drive ; "Incorrect number of thread records"
body: <p>I have successfully installed and run the OSX 10.11 on virtualbox a few while ago and I was able to successfully work with it and install xcode 7 on it and work with it without problems.</p>
  
  <p>Now after a few days I have come to it and I have run the virtual machine and got the following error!!</p>
  
  <p><a href="https://i.stack.imgur.com/IYSqm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IYSqm.png" alt="Mac OSX boot screen"></a></p>
  
  <p>It says: "Checking catalog file, incorrect number of thread records". It keeps working a while and finishes with closing the VM.</p>
  
  <p>I didn't make any changes to it. I even created a new machine again using the existing ".VMDK" file and still no change. </p>
  
  <p>I really need the data on it. Can you please help me with fixing the virtual machine? I have a .VMDK file with the size of 43 GB.</p>
  
  <p>Thanks in advance.</p>