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I'm using WMI to get info about hard drives on a computer but I just can't find the property that will allow me to identify which hard drive is used as system drive where Windows is installed.

ManagementObjectSearcher mos_HDD = new ManagementObjectSearcher("select * from Win32_DiskDrive");
I tried iterating through all properties but neither one looks like it holds the info I need.
foreach (ManagementObject mo_HDD in mos_HDD.Get())
      Console.WriteLine("HDD Properties:");
      foreach (PropertyData pd in mo_HDD.Properties)
           Console.WriteLine("\tName: {0} \tValue: {1}", pd.Name, pd.Value != null ? pd.Value.ToString() : "NULL");
I've also looked at MSDN documentation but w/o luck.
What I'm trying to do here is to get some kind of identifier for a system drive (such as Signature or Serial number). 
Any help to get this info is highly appreciated.
            ManagementObjectSearcher searcher = 
                new ManagementObjectSearcher("root\\CIMV2", 
                "SELECT * FROM Win32_DiskDrive"); 
            foreach (ManagementObject queryObj in searcher.Get())
                Console.WriteLine("SerialNumber: {0}", queryObj["SerialNumber"]);
                Console.WriteLine("Signature: {0}", queryObj["Signature"]);
        catch (ManagementException e)
Your management object will have those properties in it.
If you're getting null for those values then the problem is that you're using a version of Windows that doesn't support them.
SerialNumber
Windows Server 2003 and Windows XP:  This property is not available.
In which case you have to use the Signature property, but this requires XP SP3 I believe.
                Thanks for the details. I checked both of these and SerialNumber looks just fine but the problem is when there are several hard disks in the system. How will I know which one holds the system partition?
– Dragan Radivojevic
                Aug 1, 2013 at 21:22
                Find the drive containing a Win32_LogicalDisk where the DeviceID == C: (or whatever drive letter Windows is installed on)
– PhonicUK
                Aug 2, 2013 at 12:49
                I couldnt find the solution to this but this is the closest as it gets so I'm marking it as answer.
– Dragan Radivojevic
                Sep 23, 2013 at 18:30
There is a class Win32_LogicalDisk similar to Win32_Diskdrive which has the volumes, rather than the physical disks. It has a name property which has the drive letter. 
The environment variable %SystemRoot% has the path where windows is (e.g. D:\windows) 
Also in registry Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion SystemRoot.
So you can compare SystemRoot drive letter to the Name property from Win32_LogicalDisk.
I believe that there is a way to get a list of volumes from the properties of Win32_Diskdrive but I've not tried it.
        
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