Warning: Disk has a valid GPT signature but invalid PMBR

(Doc ID 401038.1)

Last updated on MARCH 08, 2017

Applies to:

Linux Kernel - Version: 2.4 to 2.6
Linux Itanium
Linux x86-64
Linux x86

Symptoms

System consistently gets  the following in /var/log/messages

  Warning: Disk has a valid GPT signature but invalid PMBR.
  Assuming this disk is *not* a GPT disk anymore.
  Use gpt kernel option to override.  Use GNU Parted to correct disk.
  unknown partition table

Cause

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