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Some are comparing this drive to the "Blue" WD6400AAKS, and though they are the same size there are differences. The Blue has 16MB cache vs. 32MB. In real life this actually doesn't make a big difference by itself. What the Black gives you to go along with double the cache is two microprocessors instead of one. The Black also has two motor mounts for stability, one on each end of the shaft, whereas the Blue has only one. All in all the differences in performance aren't going to be earth shattering for most every day use. Large transfers and mixed file access will favor the Black, but it isn't by a huge amount.


None, mine is still running flawlessly.

Other Thoughts:

So what does the extra 15 bucks give you? For starters you get 5 years warranty rather than 3. The better construction should translate to longer life, but it is too new to know for sure at this point. If you think a better warranty, bigger cache, dual processors, and sturdier construction, and a little better performance is worth $15 then opt for this drive, otherwise get the WD6400AAKS which is a fine drive on its own merits.

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  • David E.
  • Verified Owner
  • Owned For: 1 week to 1 month

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