The New Hard Drives - 4200 rpm vs. 5400 rpm?

Hi,
Many thanks in advance for your attention.
The new MacBooks (and MacBook Pros) offer two Hard Drives.
160GB at 5400 rpm
and
200GB at 4200 rpm.
I do a lot of video editing. Isn't the 4200 (slower) HD inferior?
Why would more GB be offered at a slower rpm?
- Ross

Keep in mind that some drives have perpendicular technology in them, improving their performance even if the rpm is slower. the 160 GB 5400 in the current MBP's is one of those.
http://en.wikipedia.org/wiki/Perpendicular_recording

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