Hello, out of the blue my well-functioning Seagate 1 TB external hard drive suddenly stopped being accessible. Besides my MacBook, I tried it on another Mac notebook and a Windows system notebook. The same result. I have given it to my computers man for data retrieval. He says it is a critical situation, as the partitioning / files index system has gone. He is trying to do what he can to retrieve. Any advice? Many thanks.
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