How to get serial no of the primary hard disk (OS installation disk) using C# ?

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C#

hi,
i try to get Serial no of the primary Hard Disk (OS installation disk) using C# to identify the Customer PC.

What I have tried:

i tried this code but the issue that when i inserted any Flash disk or another temporary disk the serial changed , the below code get the flash disk serial not the primary hard disk . so how to update this code to get only the Primary Hard disk serial (that contains Windows OS installations).

 public static List<HardDrive> hdCollection = new List<HardDrive>();
        private static void GetAllDiskDrives()
        {
            var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");
            hdCollection.Clear();
            foreach (ManagementObject wmi_HD in searcher.Get())
            {
                HardDrive hd = new HardDrive();
                hd.Model = wmi_HD["Model"].ToString();
                hd.InterfaceType = wmi_HD["InterfaceType"].ToString();
                hd.Caption = wmi_HD["Caption"].ToString();

                hd.SerialNo = wmi_HD.GetPropertyValue("SerialNumber").ToString();//get the serailNumber of diskdrive
                
                hdCollection.Add(hd);
            }
        }
        public class HardDrive
        {
            public string Model { get; set; }
            public string InterfaceType { get; set; }
            public string Caption { get; set; }
            public string SerialNo { get; set; }
        }
public static string getUniqueDeviceID()
        {
            GetAllDiskDrives();
            var HDDData = hdCollection.FirstOrDefault();
            string HDDSerial = HDDData.Model + HDDData.SerialNo;
            string Combine = CPU_Serial + MotherBoardID + HDDSerial;
            string hash = ConvertTextToHash(Combine);
            return hash;
        }