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There is a 'tombstone' file on one of my customers shared disks in a MSCS cluster.The customer as asked me if its ok to delete the file, any ideas

It looks like this disk has been used as the quorum at some point in the past, and the quorum has been restored to the original.

This is an out of date file and can be deleted, the cluster as marked it as a tombstone file to indicate that is is no longer of any use.

hope this helps