WMI turn off disks

Question

I want to turn off disks (WMI). So far, I have the following code:

    ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\cimv2");
    ObjectQuery query = new ObjectQuery("SELECT * FROM CIM_DiskDrive");

    //create object searcher
    ManagementObjectSearcher searcher =
                            new ManagementObjectSearcher(scope, query);
    ManagementObjectCollection queryCollection = searcher.Get();

    //enumerate the collection.
    foreach (ManagementObject m in queryCollection)
    {
        Console.WriteLine("in set power state for: " + m.Path);
        ManagementOperationObserver obs = new ManagementOperationObserver();
        obs.Progress += new ProgressEventHandler(obs_Progress);
        obs.Completed += new CompletedEventHandler(obs_Completed);
        m.InvokeMethod(obs, "SetPowerState", new object[]{"7"});
    }

however, disk activity keeps on happening. Any ideas on what is going on will be appreciated.

P.S. I can see the disks in the console write line command (two drives, PhysicalDrive0 and PhysicalDrive1) — hamoub, Sep 13 '11 at 07:24

score 2 · Accepted Answer · answered Sep 13 '11 at 07:51

SetPowerState is not implemented by WMI:

http://msdn.microsoft.com/en-us/library/aa387254(v=VS.85).aspx

checking CompletedEventArgs.Status will also return MethodNotImplemented telling us that this is the case. If you want to use that method you must implement your own provider.

WMI turn off disks

1 Answers1