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Support - Discussions - Official *Trackpad Click Not Always ...
CrunchGear found this 11/2/2008 on discussions.apple.com
Mine, too, makes a slight noise when tapping (not clicking) on the left of the trackpad, but not the right. But I'd hardly characterize it as "low-quality". The trackpad is a moving part. I would expect some sound as it contacts whatever it's sitting on, even when you tap instead of click. ...