Check that the drive is powered on. 2. Check if the drive is being serviced. If yes, you can ignore this alert. 3. Check ...

1. Check that the drive is powered on. 
2. Check if the drive is being serviced. If yes, you can ignore this alert.
3. Check if the drive is connected properly.
4. In the Device Manager if the drive is not enabled or not visible, refer to your hardware manual for other troubleshooting steps.