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Old 12th Feb 2005, 19:46   #1
Sea Shadow
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SATA Power Connector

I was just looking at my SATA power adapters and noticed that there is an unused space where a wire would go. I was curious and started looking around at powersupplies online to see if any of them had a wire running into there. What I came across has really confused me now. It appears that a 3.3v rail (orange on the majority of powersupplies I looked at) is also powering the HDD.

Could anyone clarify why some SATA power connectors have a 3.3 line running to them, while others don't? And why HDDs seem to work either way?
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Old 12th Feb 2005, 23:39   #2
roll1
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I have both http://img40.exs.cx/img40/6744/satahddcables2ui.jpg I read somewhere that the 3.3v was a backup supply for the hard disk and isn't normally used.
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