Connect to vcenter, get list of datastores

get-datastores.ps1

Connect-VIServer -Server vcenter.example.com -User someuser

$output = "c:\datastores.csv"
$report = @()
foreach ($ds in Get-Datastore) {
    $row = "" | Select Name, FreeSpaceMB, CapacityMB
    $row.FreeSpaceMB = $ds.FreeSpaceMB
    $row.Name = $ds.Name
    $row.CapacityMB = $ds.CapacityMB
    $report += $row
}

$report | Export-Csv $output