Start a new Win Form .NET 8 project and place a button labeled "Get Disk Status" and two RichTextBoxes.

The Button's event handler first loads a list of drives and their status into the first RichTextBox:

ManagementObjectSearcher WMISearch = 
               new ManagementObjectSearcher(
                       "Select * from Win32_DiskDrive");
            ManagementObjectCollection Drives =
                                        WMISearch.Get();
            richTextBox1.Text = "Drive\t\t\tStatus\n";
            foreach (ManagementObject Drive in Drives)
            {
                richTextBox1.Text = richTextBox1.Text +
                  Drive.Properties["DeviceId"].
                           Value.ToString() + "\t";
                richTextBox1.Text = richTextBox1.Text + 
                  Drive.Properties["Status"].
                           Value.ToString() + "\n";
            }

To get and decode the data returned by WMI we need another RichTextBox and some appropriate headings:

richTextBox2.Text = 
        "Unknw\tUnknw\tAttribute
          \tStatus\tUnknw\tValue\
              tWorst\tRaw\t\tUnknw\n";

Now to display each set of FailData we need a foreach loop:

foreach ( ManagementObject FailData in
                          FailDataSet )
{

The data is returned as an object type but we know it’s really a byte array and the simplest way of working with it is to retrieve it and cast it to a byte array:

Byte[] data = (Byte[])FailData.
  Properties["VendorSpecific"].Value;

Finally we can add each attribute to the RichTextBox making use of the fact that each block of 12 bytes corresponds to an attribute:

for (int i = 0; i < data[0]-1; i++)
{
 for (int j = 0; j < 12; j++)
 {
  richTextBox2.Text = richTextBox2.Text
   + data[i*12+j] + "\t";
  }
 richTextBox2.Text = richTextBox2.Text + "\n";
}

If you now run the program you will see the raw SMART data displayed as a table. Your next task is to process it and build it into a useful reporting tool that will warn you if anything is going wrong.

The raw SMART data

The complete program is:

namespace WinFormsApp1
{
    using System.Management;
    using System.Windows.Forms;

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            richTextBox2.Text = "Unknw\tUnknw\tAttribute
               \tStatus\tUnknw\tValue\tWorst
                   \tRaw\t\tUnknw\n";
        }

        private void button1_Click(object sender, 
                                         EventArgs e)
        {
            ManagementObjectSearcher WMISearch = 
                new ManagementObjectSearcher(
                        "Select * from Win32_DiskDrive");
            ManagementObjectCollection Drives = 
                                       WMISearch.Get();
            richTextBox1.Text = "Drive\t\t\tStatus\n";
            foreach (ManagementObject Drive in Drives)
            {
                richTextBox1.Text = richTextBox1.Text +
                    Drive.Properties["DeviceId"].
                              Value.ToString() + "\t";
                richTextBox1.Text = richTextBox1.Text +
                             Drive.Properties["Status"].
                              Value.ToString() + "\n";
            }
            WMISearch.Scope = new ManagementScope(
                                        @"\root\wmi");
            WMISearch.Query = new ObjectQuery(
               "Select * from 
                 MSStorageDriver_FailurePredictData");
            ManagementObjectCollection FailDataSet = 
                                      WMISearch.Get();
            foreach (ManagementObject FailData 
                                       in FailDataSet)
            {
                Byte[] data = (Byte[])FailData.
                      Properties["VendorSpecific"].Value;
                for (int i = 0; i < data[0] - 1; i++)
                {
                    for (int j = 0; j < 12; j++)
                    {
                        richTextBox2.Text = richTextBox2.
                          Text + data[i * 12 + j] + "\t";
                    }
                    richTextBox2.Text = richTextBox2.
                          Text + "\n";
                }
            }

        }

    }
}