Which laptop hard drive is better?

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Indeed. The integrated cache on a hard drive has virtually no effect on real life performance while RPM translates almost directly to speed (seek times). 7200 RPM is about ~30% faster.
 
10K (and even 15K) RPM 2.5" SAS hard drives are pretty common :)

I suppose you are interested in SATA? I don't think there are any such things out there. The heat output and power consumption would make the things unusable in a laptop.
 
Be careful eventhough the drive is running at 7200RPM you'll use more battery life to power that drive. The 5400RPMs with the 8MB buffer will make it feel like a 7200RPM which would use less battery. You won't even noice the speed difference if any.
 
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