Find empty datastores

[COS]

We have about 200+ datastores.

Most are used, some are not. Departments pay for them.

How can I get a list of the empty datastores?

I figure if it's not being used, the departments should know so they don't have to pay for them.

[LucD]

A datastore is seldom empty.
What would you consider as being used by the user?
Only VM related files?

Also orphaned VM related files?

[COS]

Only VM related files.

Orphaned VM related files can be disregarded.

Thanks

[LucD]

In that case the following should give you the names of the datastores that are not used.

Get-Datastore | where{(Get-VM -Datastore $_).COunt -eq 0} |

Select Name