Western Digital (WD1200BEVS) 120 GB SATA Hard Drive Logo

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Posted on Feb 28, 2011
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I am having several sata hdd what i noticed is the third connector on the drive 1data 2 power and3?

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Many older sata drives have two power connectors.

These are

Sata (Data)
Sata (Power)
Moles (Power)

The reason for this is that when SATA drive first came around many power supplies had many molex connectors and usually only one SATA power connectors.


If you were to need multiple drives this would force an upgrade of you psu or use 2 Molex to 1 Sata adaptors.

The simple answer is that HDD manufacturers did this to make life easier on the customer and to avoid any product returns due to poor buying decisions.


Please also make sure to only use one of the power connectors. Using both will likely not cause harm but is unneccessary,

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Most SATA hard drives have both the molex and SATA power connectors to work with every PSU (power supply unit). There's a good chance that your third connector is the Molex one, don't worry about it.

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