From: "Rich Gauszka" 

http://www.extremetech.com/article2/0,1558,2131552,00.asp?kc=ETRSS02129TX1K0000
532

 Even so, Hitachi needs five platters and ten heads to hit 1TB. Having that
many heads can have an impact on issues like noise and power draw. For
example, the 750GB version of the drive is rated at 30dB while seeking; the
1TB sibling generates 32dB.

..

Final Thoughts: Should You Buy?
We're pretty impressed with the overall performance of the Hitachi Deskstar
7K1000. However, as we pack more data onto these compact digital devices,
the thought of losing that data is a bit daunting. Losing 160GB of data is
one thing, but losing 900GB of your digital life is quite another. If you
do opt for one of these massive drives, a good backup strategy is
essential. If you're concerned about reliability, two drives set up in a
RAID 1 configuration may give you a little peace of mind, but RAID 1 is no
substitute for a good backup.

The
price for the 7K1000 is impressive: $399 (MSRP) for a one terabyte drive.
That price is pretty close to what we've seen on the web, with some web
shops selling as low as $389, while others are charging as much as $599. As
supply increases, pricing will likely shake out.

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