C# WMI关闭磁盘

我想关闭磁盘（WMI）。到目前为止，我有以下代码：

    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"});
    }

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然而，磁盘活动不断发生。如果您对正在发生的事情有任何想法，我们将不胜感激。

WMI不执行SetPowerState：

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检查CompletedEventArgs.Status还会返回MethodNotImplemented，告诉我们情况就是这样。如果要使用该方法，必须实现自己的提供程序。

p.S.我可以在控制台写行命令中看到磁盘（两个驱动器，PhysicalDrive0和PhysicalDrive1）