Upgrading Unibody Macbook Pro Hard Drive, 5400 RPM vs. 7200 RPM, Battery, Vibration, Heat, Noise difference?
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I would carefully read the specs on the specific drives you are looking at and take everything with a grain of salt if you read people's reviews.
In your position I would first choose a capacity (you mentioned 320gb), then a brand, and then read some reviews. Any differences in battery life will be less than dimming your screen or turning off bluetooth so I wouldn't worry about it.
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http://forums.macrumors.com/showthread.php?t=597099
http://forums.macrumors.com/showthread.php?t=337313
http://www.mac-forums.com/forums/apple-notebooks/88512-electric-shock-vibra...
http://www.mac-forums.com/forums/apple-notebooks/129544-mild-vibration-buzz...
http://discussions.apple.com/message.jspa?messageID=8302964
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