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SATA Data & Power - Are They Independent ?

Does the power supply to a SATA Hard Disk have to come from the same source as the Data's source ?

Clarification ....
In a PC, SATA disks get their power from a PSU.
The disks get their data from the motherboard which gets it's power from the same PSU.
If a SATA disk has a totally separate/independent power source will it work?

I'm thinking of using a baffle device like this ....
5 Solutions
John HurstBusiness Consultant (Owner)Commented:
You would need to ensure the independent voltage is properly regulated and precisely the voltage you need.
You would need to make sure the independent voltage is grounded to the same earth ground as the PC.

Beware of ground loops but otherwise it should work.
John TsioumprisSoftware & Systems EngineerCommented:
Normall eSata doesn't carries power....so you need a separate power source to power on your disk...except a rare case of ESATAp where power is provided...
Yes, you can power the SATA drive from any power source that provides the right voltage and sufficient amperage; it doesn't have to be coming from the same power supply as is powering the motherboard.
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From the engineering/SATA specification perspective, SATA devices don't require a common ground between the motherboard and peripherals.  As such, the source of the power doesn't matter.

As long as your enclosure is rated for sufficient voltage levels and wattage to handle the drive then you will be OK.
EirmanChief Operations ManagerAuthor Commented:
If the PC and the external power supply are plugged into the same mains power strip
ground loops should not be a problem.
Yes, it will work if the power comes from an independent supply.

My present system works that way.  The CD and primary disk come from the Dell's power supply and two extra disks are plugged into a spare SATA connector and an eSATA plug for data.  Power for these two disks comes from an old external PSU supply shanghaied into service.

Warning:  If you use an old PSU in this way ensure there is sufficient load on it.  Some PSU's don't like running with no load on them.
John HurstBusiness Consultant (Owner)Commented:
Yes correct, ground loops should not happen from the same grounded device.
you can even power the older IDE type drives like this -no problem
i even powered the AUX power connector for the cpu from a separate power source - no problem either
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