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The click is caused by software stepping the drive head, which causes the drive to update the diskchange signal. No-click software works by asking the drive to step the head beyond its normal range. Many drives will ignore such a request (but still update the diskchange signal), and will thus be silent. Other drives will attempt to step anyway, making the softer ticking sound, and potentially causing damage in the process. So if your drive makes any sound at all when no-click is in use, stop using it.
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