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SATA Power and Molex?

post #1 of 12
Thread Starter 
Hi, on my Western Digital 16MB 250GB HD, i have a SATA power plug and a molex power plug. Am i supose to plug both the SATA power and molex power into the HD? i currently just have the SATA plug pluged in and it works fine. are both cables supose to be in or is the molex added on there by WD for ppl that doesn't have a SATA plug?
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post #2 of 12
No do not plug in both! One or the other is fine. Its more a function of your wiring setup.
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post #3 of 12
Yes only use one or the other..there both the same anyway but having both in can kill your HDD so becareful nad remove atleast one power cable.
post #4 of 12
Thread Starter 
oh alrite thanks, my friend has both plugged in though and nothing good or bad has happened.
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post #5 of 12
Quote:
Originally Posted by JacKz5o
oh alrite thanks, my friend has both plugged in though and nothing good or bad has happened.

Ouch...hopefully it was just drawing the power it needed. I would of thought if there was too many volts going in it would burn out the controller/logic board. Maybe it would just generate alot of extra heat...what ever the effect, I can't see it being good to have both hooked up.
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by Vagrant Storm
Ouch...hopefully it was just drawing the power it needed. I would of thought if there was too many volts going in it would burn out the controller/logic board. Maybe it would just generate alot of extra heat...what ever the effect, I can't see it being good to have both hooked up.
ya, i was thinking it just takes the required power or the molex 4 pin was for ppl with no SATA power cables..
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post #7 of 12
Quote:
Originally Posted by JacKz5o
oh alrite thanks, my friend has both plugged in though and nothing good or bad has happened.
The same happened with me i wasnt all that experienced with SATA drives at that time and used both connections and nothing happened thank god.
post #8 of 12
Why should anything happen?

It's not like the 12v/5v red/yellow (that comes from the same connectors in the PSU) in the two plugs suddenly gets transformed into something else. IT's just double wiering, thats all!!

If you take 17 red pieces of red wire, and 17 pieces of black wire. Hook them up in parralel to your .... say fan!! It dosn't run 17 times as fast. It runs exactly as fast as it did before. You just have a 17 times thikker cable.
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post #9 of 12
The molex is for backwards compatability. Skipper is right - unless the drive is really badly designed, or your PSU is unusual and provides two 12v rails (Some people will combine two cheap PSUs rather than pay for a high-power one), the connectors should be just wired together and it will work fine.

The SATA power connector is the only power connector actually required for SATA drives. Its easier to insert and remove than a molex - SATA was intended for high-performance redundent bulk storage, where its usful to be able to pull a drive and insert a replacement without having to squeeze a hand behind it and wriggle the power connector free. SATA power connectors can be built directly into the backpane of a NAS appliance, even. The molex is optional.
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post #10 of 12
Well i always thought that having two power source go into one thing only requiring one would not be good for it.
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