Check disk space with Powershell

Need to monitor disk space on multiple servers? Then make the job easy with this Powershell script. To configure this script just create a file called serverlist.txt in your user profile folder, C:\Users\Rhys on my laptop. The $percentWarning variable allows you to control at what percentage level you will be warned about free disk space. If disk space is less than this then the text will be coloured red to draw your attention to it. The script will also output a datetime stamped csv file in your user folder containing similar data.

# Issue warning if % free disk space is less
$percentWarning = 15;
# Get server list
$servers = Get-Content "$Env:USERPROFILE\serverlist.txt";
$datetime = Get-Date -Format "yyyyMMddHHmmss";

# Add headers to log file
Add-Content "$Env:USERPROFILE\server disks $datetime.txt" "server,deviceID,size,freespace,percentFree";

foreach($server in $servers)
{
	# Get fixed drive info
	$disks = Get-WmiObject -ComputerName $server -Class Win32_LogicalDisk -Filter "DriveType = 3";

	foreach($disk in $disks)
	{
		$deviceID = $disk.DeviceID;
		[float]$size = $disk.Size;
		[float]$freespace = $disk.FreeSpace;

		$percentFree = [Math]::Round(($freespace / $size) * 100, 2);
		$sizeGB = [Math]::Round($size / 1073741824, 2);
		$freeSpaceGB = [Math]::Round($freespace / 1073741824, 2);

		$colour = "Green";
		if($percentFree -lt $percentWarning)
		{
			$colour = "Red";
		}
		Write-Host -ForegroundColor $colour "$server $deviceID percentage free space = $percentFree";
		Add-Content "$Env:USERPROFILE\server disks $datetime.txt" "$server,$deviceID,$sizeGB,$freeSpaceGB,$percentFree";
	}
}