# Code Snippet from aperturescience.su
# Parameters

# Body
Write-Verbose "Starting volume checks..."
$volumes = Get-WmiObject win32_volume -filter "drivetype=3"
foreach ($volume in $volumes)
{
	$driveletter = $volume.name
	Write-Verbose "Checking $driveletter"
	if (!($thresholdexcludesystem -and ($volume.systemvolume)))
	{
		# Disk space checks
		$freespace = $volume.freespace /1Gb
		$result =  $freespace -lt $threshold
		if ($result)
  		{
			send-email "WARNING: volume $driveletter has only $freespace left, this is less than threshold $threshold" $false
  		}
		else
		{
			send-email "volume $driveletter has more than enough disk space, $freespace with threshold $threshold" $true
		}
 	}
 	else
 	{
  		Write-Verbose "Skipping $driveletter as it is a system drive and I am excluding it from threshold checking"
 	}

	# Dirty Flag Checks/checkdisk 
	# 1. http://social.technet.microsoft.com/Forums/en-US/ITCG/thread/ac0a7de1-fc43-4a01-8ffb-371ef9845bbc
	# 2. http://gallery.technet.microsoft.com/scriptcenter/57076851-97fb-4af6-8c5c-1e34156ceab4 using chkntfs
 
	#1 
	Write-Verbose "WMI Check"
	$wmidirtybitset = $volume.dirtybitset
	if ($wmidirtybitset)
	{
		send-email "WARNING: volume $driveletter is marked as dirty in WMI" $false
	}
	else
	{
		send-email "$driveletter is not marked as dirty in WMI" $true
	}
 
	#2 This doesnt work for volumes without a drive letter
	if ($volume.driveletter -ne $null)
	{
		Write-Verbose "chkntfs Check"
		$chkntfsresult = ""
		try
		{
			$tempchkntfsresult = chkntfs $volume.driveletter
			$chkntfsresult = [string]$tempchkntfsresult
		}
		catch
		{
   			send-email "error running chkntfs.exe" $false
  		}
  
  		$chkntfsdirtybitset= (($chkntfsresult.contains("run on next reboot")) -or ($chkntfsresult.contains("is dirty")))
  
		if ($chkntfsdirtybitset)
		{
			send-email "WARNING: volume $driveletter is marked as dirty in chkntfs" $false
		}
		else
		{
			send-email "$driveletter is not marked as dirty in chkntfs" $true
		}
	}
 
	# Defrag recommended
	$mustdefrag = $volume.DefragAnalysis().DefragRecommended
	if ($mustdefrag)
	{
		send-email "WARNING: volume $driveletter should be defragmented" $false
	}
	else
	{
		send-email "$driveletter doesn't need to be defragmented" $true
	}
}

# Code Snippet from aperturescience.su