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Question about SATA hard drives


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#1 RB_Kandy

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Posted 16 July 2012 - 06:09 PM

What happens if you plug the SATA power cable in, and then you plug in the molex power cable? Like does it default to one or the other, does it divide the voltage, or does it burn up the HDD?

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#2 rotor123

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Posted 16 July 2012 - 06:20 PM

That would most likely make it the Old SATA I drive. Nothing should happen, however why tempt fate. Use 1 or the other not both. They only came that way when SATA was the new kid on the block and computers didn't have SATA power plugs.

The 5 volt and the 12 Volt wires in each plug are most likely coming off of the same power rail in the Power Supply. Unless you have a fancy Power supply.

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#3 Platypus

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Posted 16 July 2012 - 06:25 PM

It's an unknown quantity, so should be avoided. In the drive, the connections will simply be paralleled, so just making the same connection twice and should not harm the drive (but see below).

For a single rail PSU design, it's the same for the PSU end - the wires for each voltage all come from the same place, so no problem, just pointless. For a multi-rail PSU you mustn't make a cross-connection between rails of the same voltage, and you won't be certain if the drive power connectors all come from a common rail. They probably do, but if not, the PSU could be damaged or shut down, or connector contacts could be burned by inappropriate current flow.

Edit: rotor posted while I was typing...

Edited by Platypus, 16 July 2012 - 06:26 PM.

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