Gets disk utilization from local and remote machines

DiskUtilization.ps1

[CmdletBinding()]
Param ([Parameter(Mandatory=$False,Position=0)]
         [String[]]$ComputerName = "SERVER")

Write-Host ""

# Change these values
$IgnoreSystemReserved = $true
# Percents must be expressed as a decimal value (e.g. 50% is 0.5)
$WarningPercent = 0.15
$DangerPercent = 0.1
$CriticalPercent = 0.05

ForEach ( $Name in $ComputerName ) {
   Write-Host "Disk Utilization for $Name is: "
   Get-WmiObject  -ComputerName $Name -Class Win32_Volume `
      | Format-Table  -auto `
         @{Label="Drive";`
            Expression={$_.DriveLetter};`
            Align="Right"},`
         @{Label="Volume Label";`
            Expression={$_.Label};`
            Width=25},`
         @{Label="Size";`
            Expression={`
               If($_.Capacity / 1GB -lt 1) {"{0:N0} MB" -f ($_.Capacity / 1MB)}`
               ElseIf($_.Capacity / 1TB -lt 1) {"{0:N0} GB" -f ($_.Capacity / 1GB)}`
               Else {"{0:N0} TB" -f ($_.Capacity / 1TB)}};`
            Align="Right"},`
         @{Label="Free";`
            Expression={`
               If($_.FreeSpace / 1GB -lt 1) {"{0:N0} MB" -f ($_.FreeSpace / 1MB)}`
               ElseIf($_.FreeSpace / 1TB -lt 1) {"{0:N0} GB" -f ($_.FreeSpace / 1GB)}`
               Else {"{0:N0} TB" -f ($_.FreeSpace / 1TB)}};`
            Align="Right"},`
         @{Label="% Free";`
            Expression={"{0:P0}" -f ($_.FreeSpace / $_.Capacity)};`
            Align="Right"},`
         @{Label="% Used";`
            Expression={"{0:P0}" -f (($_.Capacity - $_.FreeSpace) / $_.Capacity)};`
            Align="Right"},`
         @{Label="Status";`
            Expression={`
               $PercentFree = $_.FreeSpace / $_.Capacity;`
               If($IgnoreSystemReserved -and $_.Label -eq "System Reserved") {"IGNORED"}`
               ElseIf($PercentFree -le $WarningPercent -and $PercentFree -gt $DangerPercent) {"WARN"}`
               ElseIf($PercentFree -le $DangerPercent -and $PercentFree -gt $CriticalPercent) {"DANGER"}`
               ElseIf($PercentFree -le $CriticalPercent) {"CRITICAL"}`
               Else {"OK"}};`
            Width=8};
}

Call via the command line: powershell "DiskUtilization.ps1" "SERVER","SERVER2"