There may be times when Win32 Disk Imager is not showing your device. This is either caused by your computer not being able to detect your device or by the program not having the privileges to access removable media connected to your computer. Please make sure that your removable media is in working condition and can be detected by your computer while having Win32 Disk Imager “Run as Administrator”. Also make sure your alarm USB device is working properly. Sometimes it is the USB port that does not work properly, not the USB drive.