If setting the noclick flag makes your drive louder, don't use it. It might cause your drive to go off alignment.
The Amiga clicks the drives, because otherwise the diskchange line's state is unknown. You must step the drive somewhere, then the DC status is reset and you can read it.
Normally the Amiga steps in the first time and then out and repeat.
After setting the noclick flag (present in the trackdisk.device of ks 3.0 and better), the drive starts stepping out only. The drive should refuse to step further than track 0, thus giving you silence.
Some drives don't implement this and will happily hammer the heads against the end stopper.. This will cause the track 0 position to drift and you'll end up with an unreliable drive that writes broken disks.