Failed to open disk scsi0:0: Unsupported and/or invalid disk type 7" error when trying to power on a VM on ESXi

If you face this error message when powering on a Virtual host, try the below steps to get over it.

Go to your disk file location. and type..

 vmkfstools -i nagiosxi.vmdk -d zeroedthick nagiosxi1.vmdk

and then delete the original .vmdk file (Mine : nagiosxi.vmdk) and rename the newly created file (Mine: nagiosxi1.vmdk) as the name of the original file (Mine : nagiosxi.vmdk)

Good luck.....................

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