Is it bad for a hard drive to click? because when ever i pick up my mac is mac a click noise near the hard drive and people are saying it is sms or something?

??

SMS means "Sudden Motion Sensor." Its purpose is to immediatly park the hard drive head to protect the drive platters from damage, whenever sudden motion is detected (like the laptop falling quickly toward the ground).
Read this for more info:
http://support.apple.com/kb/HT1935
I don't normally hear the click on mine, though I guess some people say it can be audible. Maybe it depends, like the way some hard drives are louder than others.

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