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If your JPEG2000 is giving the error “No HDD detected”, this means it is not recognizing the internal Hard Drive being used to store the recorded videos. This would explain why you are not able to look at the previously recorded data. To fix this issue you will need to replace the internal Hard Drive, for instructions on how to replace / add a Hard Drive please see the following article — https://www.cctvcamerapros.com/DVR-Hard-Drive-Installation-s/218.htm
Please let me know if you have any questions.