Mac does not recognize external drive

3TB G drive, originally, before the time capsule used as a back up destination.
Now it does not show in the Finder or on the desk top when plugged into FireWire 400 port.

Hello!
Is this one of those WD drives that uses the WD Unlock Tool? Do you see anything like that in the Finder instead of the HDD itself? If so you can unlock the drive from there and use it.

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