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Its not really available yet despite it being on the seagate site. If you want 750gb or 1tb you can get some made by Western Digital from Amazon or Newegg.
 
If you read reviews on other 7200RPM Seagate drives, you'll notice that there seems to be a good chance of drive failure fairly early into the lifecycle of the drive. Other manufacturers such as WD seem to have much lower mortality rates.

Just something to consider.
 
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