Removing a datastore from datacenter

Hi,

I am using vCenter 6.5 server installed on a windows server. Unfortunately my datastore has gone missing from cluster but I can see that still in the Datacenter.

There is no option to mount or unmount and until I remove this the same disk cannot be used from the backup as it has to be used with same thumbprints to get the VMs back.

Any help here is much appreciated.

Regards

Amit Sharma