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Custom SATA Power Cabling (5th Wire)

post #1 of 3
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If I were going to construct my own modular SATA power cables for connecting an optical drive, a 3.5" HDD (Western Digital Black) and an SSD (Samsung 840 Pro), is the fifth, 3.3V wire -- usually orange, if the wiring is color-coded -- necessary?

The SATA power cables that came with my Corsair PSU are five conductor, but from what I am reading most SATA devices don't require the 3.3V supply line. Are there any examples of SATA devices that do require it?
post #2 of 3
Quote:
Originally Posted by stahlhart View Post

If I were going to construct my own modular SATA power cables for connecting an optical drive, a 3.5" HDD (Western Digital Black) and an SSD (Samsung 840 Pro), is the fifth, 3.3V wire -- usually orange, if the wiring is color-coded -- necessary?

The SATA power cables that came with my Corsair PSU are five conductor, but from what I am reading most SATA devices don't require the 3.3V supply line. Are there any examples of SATA devices that do require it?

As you mention, the 3.3V wire is part of the specification, but generally is not used by any of the common sata hardware.

The best way to tell for your specific hardware, would be to use a molex to sata adapter.

If it works, just use 4 wires for your custom cable.


Somehow, somewwhere, theres a bit of hardware that actually needs the 3.3V line, and as soon as you make a custom cable and don't provide it, that bit of hardware will end up in your build.

Check twice, fabricate once,

Darlene
post #3 of 3
Quote:
Originally Posted by stahlhart View Post

If I were going to construct my own modular SATA power cables for connecting an optical drive, a 3.5" HDD (Western Digital Black) and an SSD (Samsung 840 Pro), is the fifth, 3.3V wire -- usually orange, if the wiring is color-coded -- necessary?

The SATA power cables that came with my Corsair PSU are five conductor, but from what I am reading most SATA devices don't require the 3.3V supply line. Are there any examples of SATA devices that do require it?

Actually most sata devices do work properly without the 3v line especially with optical drives however I would not suggest not using it on a SSD. The 3v is there for a reason no mater what any one else says, just like the second ground is there for a reason. Most SSD's and some HDD's use the 3v line to suspend to low power state. I have had a few not work at all unless the 3v is provided....... Its important because its ability to reduce use during times of idle prolongs the lifespan of SSD's. thumb.gif
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