VMware KB 1008886 – Unable to read partition from Add Storage Wizard
These are great instructions if you have received errors when trying to add a LUN to an ESX Host, and suspect that the LUN may not be READY, or write enabled these instructions can help you troubleshoot and/or fix the LUN.
If you are unable to re-write the LUN label, the disk is not READY or not write enabled. Otherwise, if the label is something other than msdos, it should now be able to be added after following these instructions.
*Warning* Using Parted incorrectly could destroy data on LUNs in use, if not used properly!
VMware KB 1008886 – Unable to read partition from Add Storage Wizard