I had my MPB13″ for almost a month now and for the past two days I have been hearing occasional weird clicking sound. After doing doing some Google search, I found out that mostly only the 500Gb 7200rpm disk that is used have such problem (as discussed here) while mine being the 500Gb 5400rpm shouldn’t be generating that kind of clicking sound. The problem appears to be the hard disk firmware being zealously parking its head while being inactive and the clicking sound is suppose to be normal. But as for me, having the disk head park too often might cause wear and tear and inevitably lead to faster harddisk failure. After going thru tonnes of discussions on the net, I found a solution call hdapm. I installed it last night and surely enough the clicking sound is gone by having the apps forcing the harddisk not to park its head all the time. I am not sure whether this will cause the battery to be depleted faster but at least the annoying clicking sound is gone for now.
In the meantime, I will be doing more research to see whether hdapm, will cause the Sudden Motion Sensor to be inactive. If it does that will be a bummer!
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