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One recommendation I would give is to probe your code and/or run it in highlight execution mode. This will allow you to see the string that is going into your tdms file. I would put in some way to monitor the string array input into the TDMS write. It may be tat the data is not getting passed correctly from one case structure to another. Some other tips are to use shift registers instead of feedback nodes if you just want to pass data from one loop iteration to another.
Paolo F. National Instruments Applications Engineer