//Create the authenticator file according to the flash memory name by caling CreateAuthenticator(flashmemoryname);
//Authenticate(flashmemoryname) return true if the authenticator.chk is found with the same properties and flash name while it returns false if the only the data in the file is different and normally it will loop through all drives if none of the previous constraints happen.

        private void CreateAuthenticator(string myFlashMemoryName)
        {
            string fullSerial = "";
            System.IO.DriveInfo di=null;
            foreach (System.IO.DriveInfo inf in System.IO.DriveInfo.GetDrives())
            {
                if (inf.IsReady && myFlashMemoryName == inf.VolumeLabel)
                {
                    di = inf;
                    fullSerial = (inf.VolumeLabel + "/" + inf.DriveType.ToString() + "/" + inf.DriveFormat + "/" + inf.TotalSize.ToString());
                    break;
                }
            }
            if (di != null)
            {
                System.Security.Cryptography.MD5 md = System.Security.Cryptography.MD5.Create();
                string md5 = System.Text.Encoding.Default.GetString(md.ComputeHash(System.Text.Encoding.Default.GetBytes(fullSerial)));
                System.IO.File.WriteAllText(di.Name + "authenticator.chk", md5);
            }
        }

        private bool Authenticator(string myFlashMemoryName)
        {
            string fullSerial = "";
            System.IO.DriveInfo di = null; 
            while(true)
            {
                foreach (System.IO.DriveInfo inf in System.IO.DriveInfo.GetDrives())
                {
                    if (inf.IsReady && inf.VolumeLabel == myFlashMemoryName)
                    {
                        di = inf;
                        fullSerial = (myFlashMemoryName + "/" + inf.DriveType.ToString() + "/" + inf.DriveFormat + "/" + inf.TotalSize.ToString());
                        break;
                    }
                }
                System.Security.Cryptography.MD5 md = System.Security.Cryptography.MD5.Create();
                string md5 = System.Text.Encoding.Default.GetString(md.ComputeHash(System.Text.Encoding.Default.GetBytes(fullSerial)));
                string data="";
                if (di != null)
                {
                    if (System.IO.File.Exists(di.Name + "authenticator.chk"))
                        data = System.IO.File.ReadAllText(di.Name + "authenticator.chk");
                    if (md5 == data)
                        return true;
                    else
                        return false;
                }
                System.Threading.Thread.Sleep(100);
            }
            return false;
        }

using System.Management;

namespace USBSNTool

{
    static class Program {

        private static void Main()
        {

            int enCount = 0;
            btnRefresh.Enabled = false;

            Console.WriteLine("Enumerating USB Storage devices..." + Environment.NewLine);

            // Perform an SQL-style search in WMI for USB devices.
            // All USB storage devices start with "USBSTOR"
            ManagementObjectSearcher searcher1 = new ManagementObjectSearcher("SELECT * FROM win32_pnpentity where deviceid like 'USBSTOR%'");

            // Iterate through all found USB objects.
            foreach (ManagementObject dm in searcher1.Get())
            {

                string did = dm["DeviceID"].ToString();

                Console.WriteLine("Found USB Mass Storage device" + Environment.NewLine +
                    "Vendor: " + parseVendorFromDeviceID(did) + Environment.NewLine +
                    "Product: " + parseProductFromDeviceID(did) + Environment.NewLine +
                    "Serial: " + parseSerialFromDeviceID(did) + Environment.NewLine);

                enCount++;
            }

            Console.WriteLine("Finished, found " + enCount.ToString() + " devices.");
        }

        private string parseSerialFromDeviceID(string deviceId)
        {
            string[] splitDeviceId = deviceId.Split('\\');
            string[] serialArray;
            string serial;
            int arrayLen = splitDeviceId.Length - 1;

            serialArray = splitDeviceId[arrayLen].Split('&');
            serial = serialArray[0];

            return serial;
        }
        private string parseVendorFromDeviceID(string deviceId) {
            string[] splitDeviceId = deviceId.Split('\\');
            string[] serialArray = splitDeviceId[1].Split('&');
            string serial = serialArray[1].Remove(0, 4);
            serial = serial.Replace("_", " ");
            return serial;
        }
        private string parseProductFromDeviceID(string deviceId)
        {
            string[] splitDeviceId = deviceId.Split('\\');
            string[] serialArray = splitDeviceId[1].Split('&');
            string serial = serialArray[2].Remove(0, 5);
            serial = serial.Replace("_", " ");
            return serial;
        }
    }
}