Upgrading hard disk from 320 GB to 500 GB

Hi Mac Gang,
By how much will the weight of my 13" macbook pro increase by upgrading the hard disk from 320GB to 500GB?
Thanks!

It's not the size (space) of a drive that increases its weight, it's more likely the speed of a drive that affects its weight. A 7200 RPM drive generally weighs more than its 5400 RPM counterpart (given the same model and same manufacturer), regardless of the amount of disk space in GBs. (The weight difference between these two different speed drives is probably only about 10-20 g.)
FYI: Data on a hard drive has no weight, either. ; )
http://technopedia.info/tech/2009/07/11/does-hard-drive-weight-increase-with-dat a.html

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