How can I reply to forum thread?

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I’m puzzled that another post is reply-disabled since the reply was not helpful and the user manual for the drive (Passport Essential SE in my case) doesn’t answer the question.  I would like to reply to that message, be more specific in describing the problem, and be more specific in my question/concern.  So, since the OP’s question wasn’t answered, I don’t see why it can’t be replied to.  Of course, I could post a new message, but it seems I’d be making a reasonable continuation / reply.  Thoughts?