I plugged the hard drive it into a windows laptop and now it doesn't read on my Mac, have never had a problem doing this before? It is spinning fine not making any weird noises etc, working as usual but won't read on either computer anymore? Please help
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Is it showing in disk management or My computer? If it is you could try uninstalling it and re-installing.
No, can't find it anywhere is really strange. Is a bit disconcerting as have about 650gb of stuff on there...:-(