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For many people, a Hard Disk Drive with 5.400 RPM is sufficient, and for Apple it saves some quids.
And you can easily replace the HDD yourself without voiding the warranty.

MacBook, MacBook Pro: Replacing the Hard Disk Drive, transferring data to the new HDD

the guide includes:
  • 0. Identify your MacBook or MacBook Pro
  • 1. Getting a new HDD
  • 2. Guides to replace the internal HDD with a newer one
  • 3. Transferring data from the old HDD to the new HDD
  • 4. Using the optical disk drive (ODD) slot for placing an SSD or HDD inside the MB/P (OPTIBAY)


To learn more about Mac OS X: Helpful Information for Any Mac User by GGJstudios
 
Or buy the faster option....For all but intensive video and "Real Time" work the lower RPM although slower to boot up is fine in day to day use....They also statistically tend to last longer.
 
It does - 7200rpm and SSD are available as an option.

I'm happy with the 5400rpm drive in mine to be honest.
 
Surprisingly, the 5400RPM that originally came with the system is very fast for normal average person's use. If you're doing a lot of other stuff such as production, testing, etc. then you'll require something faster. But for like my parents and majority of my friends, 5400RPM is fine.
 
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