Powershell to check for impacted drives on a machine.

DiskSpaceCheck.ps1

$drivediskSpace = Get-PSDrive | 
                    ## Select the Name, Used amount in GB and Free space in GB
                    Select-Object Name, @{Name="Used";Expression={$_.Used / 1GB}}, @{Name="Free";Expression={$_.Free / 1GB}} | 
                    ## just pick mounted single letter drives to exclude registry
                    Where {$_.Name.Length -eq 1}
$impactedDrives = $drivediskSpace | 
                    ## Select drives where there is more than 0 bytes
                    ## and either more than 80% used or 10GB of disk space remaining
                    Where { (($_.Free + $_.Used) -gt 0) -and (($_.Used/($_.Free + $_.Used) -gt .8) -or ($_.Free -lt 10)) } | 
                    Select-Object Name, Used, Free
## if there are any drives in out list return the drive and disk amounts or exit 0
if($impactedDrives.Count -gt 0) { 
    write-output ($impactedDrives | format-list -Property Name, Used, Free, @{Name="% Used";Expression={[system.math]::round($_.Used/($_.Free + $_.Used) * 100)}} | Out-String)
    return -1 
} else { 
    return 0 
}