Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Depends on the drive really. For example the 80gb ipods drive vs the 160gb ipod...they have different number of platters.

EDIT: For example read the third paragraph of this: http://news.zdnet.co.uk/hardware/0,1000000091,39263866,00.htm

Dude, you should check the date on that, it's posted 2006! Well outta date! I'm pretty sure technology have move on since then... No fool gonna be installing 1.8" drives or even compact 2.5" laptop drives in a desktop machine... will they? Anyway, I was thinking and comparing the reliability issues of workstation and server drives, where performance matters...
 
Dude, you should check the date on that, it's posted 2006! Well outta date! I'm pretty sure technology have move on since then... No fool gonna be installing 1.8" drives or even compact 2.5" laptop drives in a desktop machine... will they? Anyway, I was thinking and comparing the reliability issues of workstation and server drives, where performance matters...

Well if you don't like "out of date" articles give this a try: http://www.xbitlabs.com/articles/storage/print/seagate-barra-720010.html Yes it was put out awhile ago BUT it still talks about the 7200.10 drives which is ALMOST the most recent drives yes i know the 7200.11 exist now but they are not very common just yet. Now search for ST3750640AS it will be your third hit down the page (where it has pictures of the drives) Here it explains the naming of the Seagate drives showing that the 4 means 4 drive platters. Now right below it is the ST3500630AS which the 500gb drive vs the 750 and as you can see it has 3 platters. The Hitachi drives also have the platter number in the model number.

But anyway thats just for informations sack. Really it doesn't change a whole lot.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.