There is no way to do this without specialized equipment. The technique you can use is the same as the way you would retrieve information from you HDD that has been erased. You read a little to the top and the bottom of the data stream on the tape and most likely you will find little bits of information that where not erased when the tape was recorded over. But as I said you need specialized equipment for that. A better way would be to find someone else with a copy of the tape and copy that one (if there is one and you can find it).
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Rabyd Rev -- 2 Timothy 2:15
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