Re: Need a power-shell script to ..

Looks like you are using an older PowerCLI version, the CapacityGB was introduced in one of the previous PowerCLI builds.

Try to upgrade.

If an upgrade is not possible, you can do

Get-Datacenter-NameMyDC|Get-VM|
Sort-Object-PropertyName|
Get-HardDisk|
Select@{N="VM";E={$_.Parent.Name}},Name,@{N="CapacityGB";E={[int]($_.CapacityKB/1MB)}},
@{N="Type";E={[string]::Join('/',($_.DiskType,$_.StorageFormat,$_.Persistence))}},
@{N="Comment";E={''*25}} |
Export-CsvC:\HD-report.csv-NoTypeInformation-UseCulture

This also sorts the VM on their Name property.