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Disconnect the drive to the Mac
Shut down your Mac.Find Command (⌘), Option, P, and R on your keyboard.Turn on your Mac.Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.Hold these keys until the computer restarts and you hear the startup sound for a second time.Release the keys.
then connect the drive and tell me if it now shows please
If you connect it via USB does it show up?