Caviar Green vs Blue vs Black For Secondary Storage

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Green drives spin at 5400rpm at low work load and 7200rpm when needed. Blue are mainstream drives and spin at 7200rpm. Black also spin at 7200rpm but have larger buffers and can move data faster.
What do you mean by "secondary storage"? If all you are going to put on it is data files, I would recommend the blue, as it is more economical. If it's for programs & applications, then load times become important, so go with the Black If it is strictly for backups, then go with the Green, as you will get more capacity per dollar.
 

ngrego

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Green drives spin at 5400rpm at low work load and 7200rpm when needed. Blue are mainstream drives and spin at 7200rpm. Black also spin at 7200rpm but have larger buffers and can move data faster.
 
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