I run WD Green drives, they run at a variable rate of 5400 to 7200, start they suck a total of 200 watts (currently at seven drives). When the system is just at idle the total power output is just below 150, overall power is not an issue nor is heat.
The only downside to the Green drives is they do go idle after X amount of time (forget how long), and then take about 2 seconds to reload where they last were. If I am viewing a 2.5 hour movie off the server and it buffers so much the drive can go idle during the movie.
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